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						This relatively detailed 
						question must be addressed from different perspectives:
						 
						
						1- How is the eternal nature 
						of Islamic laws explained?
						 
						
						2- Do we perceive the cease 
						of execution of a certain law for a period of time 
						because of extenuating circumstances or for something 
						more important as breaking the law?
						 
						
						3- How related are the 
						things you mentioned in corroboration of your claims 
						with what you were asking about?
						 
						
						Now the answers to each of 
						these questions in the same order mentioned above:
						 
						
						1- Regarding the first 
						question one must say that generally divine religions 
						are comprised of two parts, the rules that have an 
						eternal nature and those that are unstable and change.  The 
						rules that are permanent relate to the stable aspects of 
						humans life.  But 
						these religions also have paid attention to the changing 
						aspects of man's life through legislating tenets which 
						change and vary depending on the time, place, economic, 
						cultural and social circumstances.
						 
						
						What is meant by the eternal 
						nature of the Islamic law is that the permanent and 
						unchanging rules are so stable they will stay remained 
						unchanged forever, but the methods used to carry them 
						out have the flexibility to change in different 
						situations.  The 
						change of these tenets which can also be seen during the 
						time of the prophet himself does not entail the change 
						of the general and eternal rulings, for more explanation 
						you can refer to the seventeenth volume of Tafsir 
						Nemouneh, page 341 which is about the final and seal of 
						religions and to Question 
						781 of 
						this website which relates to the comprehensiveness of 
						religion.
						 
						
						2- The fact that the general 
						rules are eternal in Islam does not mean we have no 
						choice but to be fundamentalists and carry out religious 
						law while ignoring the circumstances and situation we 
						are in!  In 
						other words the eternal aspect of Islamic law is 
						somewhat intertwined with the changing aspects of 
						human's life such that the two cannot be separated from 
						each other.  This 
						is the reason why issues like secondary rules, the clash 
						of the important and more important, ezterar 
						(extenuating circumstances), ekrah (being forced) have 
						all been discussed in Islamic jurisprudence.[1]
						 
						
						When examining the Quran we 
						come across cases where even denying the oneness of 
						Allah is allowed due to a certain situation.[2]  When 
						"Ammar Yaser", one of the greatest companions of the 
						prophet, denied the oneness of Allah (swt) to save his 
						life, not only was he not blamed and criticized buy the 
						Quran, but the prophet and the Imams all supported and 
						backed his act![3]  If 
						denying the oneness of Allah which is the most 
						fundamental belief in Islam is allowed in certain 
						situations then obviously putting aside some of the 
						rules that are of less importance in such situations is 
						allowed too.  Let's 
						say stealing from others is a considered a sin in Islam, 
						but what if Islam said that if someone was so hungry and 
						needy that he would die without stealing he won't be 
						punished for it, does this mean that we are denying the 
						fact that stealing is a sin?!
						 
						
						What if we stop carrying out 
						some of the rules for a specific period of time because 
						of the potential global dangers that threat the lives of 
						Muslims? Does this mean we are putting this law aside? 
						Obviously the answer is no.  When 
						referring to the books of jurisprudence we find a 
						notable difference between "Ilgha" (nullification) and 
						"Ta’ligh" (suspension of the law).  "Ilagha" 
						means to put a certain rule away completely, but 
						"Taligh" means to cease the execution of a ruling for a 
						period of time due to certain circumstances.  If 
						one pays close attention, he will see that in many 
						cases, what is actually happening is that the execution 
						of a law is being suspended, not nullified!
						 
						
						3- As for the examples that 
						were mentioned in the question as cases where Islamic 
						law has been changed, we will analyze them one by one to 
						see what has really taken place:
						 
						
						a) The delegation of the 
						right of divorce by men to women does not entail the 
						change of the law, because this right still lies in the 
						hands of the man and it is only when a woman is facing 
						serious circumstances that the man has given her the 
						right to carry out the divorce on his behalf.  In 
						this regard there are a few points that we must pay 
						attention to:
						 
						
						First:  When 
						someone delegates a certain right he still has that 
						right, so when a man gives this right to his wife he 
						does not lose his right, because delegation does not 
						take place if one does not have a right to grant to 
						others.[4]
						 
						
						Second:  She 
						only has a right of divorce when she is facing hard 
						circumstances and having a hard time with her husband 
						and continuing to live with him becomes very harsh and 
						intolerable.
						 
						
						Third:  Taking 
						the second point into consideration it is obvious that 
						even if the right of divorce was not passed down to her 
						and she was being bothered and oppressed by her husband 
						she could always refer to a judge and get divorced, the 
						fact that Islam has granted men with the right of 
						divorce in the first place does not mean Islam will let 
						men keep women in a hard and difficult situation where 
						their rights like receiving "Nafaqah" are not respected.[5]  So 
						women actually possess this right from the beginning and 
						what is really happening when the two agree that the 
						woman have the right to execute the divorce is to ease 
						the process without any need to go to a judge and other 
						time-consuming stages.
						 
						
						b) Regarding the issue of 
						Diyah that was pointed out in the question, there are 
						two points that seem to have been overlooked:
						 
						
						1- In 
						contrast to what you have stated in your question, the 
						law of the diyah of the People of the Book is not 
						mentioned in the Quran and it is through the hadith and 
						tradition that we understand the rulings in this regard.
						 
						
						2- There is no mention in 
						our hadiths that the Diyah of the 'People of The Book' 
						is half of that of Muslims, the only thing we have about 
						being half, is the diyah of women compared to men.  The 
						amount of the Diyah of the People of the Book is 
						mentioned as being "800 Dirhams" in most books of 
						jurisprudence.[6]
						 
						
						Now, keeping these two 
						points in mind, we will analyze this matter:
						 
						
						Islamic scholars in 
						different countries have had different viewpoints 
						regarding the amount of Diyah for Non Muslims, and most 
						Shia scholars have accepted the amount of "800 dirhams"[7], 
						this has also been accepted today, but due to the 
						agreements that we have accepted and the special 
						international circumstances that were are living in this 
						law has been changed through a "secondary ruling".
						 
						
						The fact that their Diyah is 
						equal to the Diyah of  Muslims 
						is against primary Islamic law and that is why Council 
						of Guardians (who bears the responsibility of making 
						sure the country’s laws are in accordance with Islamic 
						law) has not accepted such a law, but it is because of a 
						secondary ruling and that it sees it to the benefit of 
						the country today that the Expediency 
						Discernment Council has decided to take on the 
						new law.  It 
						is easy to forget that what the Expediency 
						Discernment Council has done is not breaking the 
						Islamic law, but rather the secondary ruling is taking 
						precedence over the primary ruling due to its 
						importance. When we look back on the history of the 
						prophet we find that such a thing was done at his time 
						too. For example in the treaty of 'Hudaibiyya' he 
						surrendered one of his followers to the polytheists 
						because of an agreement he had arranged/signed with 
						them.[8]  This 
						was done even though the primary Islamic law does not 
						allow the turning over of a Muslim prisoner to the Non 
						Muslims, but the prophet did so according to these 
						secondary rulings and at that time some Muslims who 
						didn't understand these rulings opposed his opinion.
						 
						
						Therefore regarding the 
						issue of Diyah the Islamic law has not been changed but 
						its execution has been temporarily suspended due to the 
						situation we are in; this doesn’t mean that Allah (swt) 
						wasn’t aware of the fact that certain situations will 
						come up that call for other rulings, rather the general 
						rulings in Islam are set for usual situations and when 
						special situations come up, we have the secondary 
						rulings that come into play.
						 
						
						c) The next part of the 
						question had to do with the three issues of Heritage, 
						Will and Bazl (giving money or other belongings to 
						others), and all three of them were mixed, so before 
						anything else we will clearly define these three 
						concepts:
						 
						
						Bazl: Every healthy and sane 
						individual is in charge of his wealth and belongings and 
						determines how to use them, for example he can use them 
						to fulfill his or his family's needs, he can give them 
						in charity for the needy, or he can grant it to others 
						as a gift which is called Bazl, therefore no one has the 
						right to stop him from doing so, though this right of 
						his is limited when he has a disease that ends in his 
						death.
						 
						
						Will: To will means for a 
						person that is going to die to command his family to do 
						a set of things that may not even relate to financial 
						affairs.  According 
						to the Islamic law one can spend his money as he likes 
						but can only determine what happens to one third of it[9] after 
						his death and the rest belongs to the inheritors.
						 
						
						Heritage: The first thing 
						done to the money one leaves behind after he passes away 
						is that his debts are paid from that money, in the next 
						step the inheritors should act according to his will 
						regarding one third of the money, then the rest is to be 
						divided between the male and female inheritors in a 
						ratio of 2 to 1.[10]
						 
						
						Therefore the heritage of 
						one who passes away is only considered after his debts 
						are paid and his will is acted upon and the amount of 
						heritage that family members will receive does not 
						change.  Nevertheless 
						one can financially support some family members more 
						than others while alive, or can give them more money 
						through his will (that only has to do with one third of 
						his money), but as we explained above he cannot will 
						regarding to two thirds of his money and all of it will 
						be given to his inheritors.  After 
						all inheritors have received their share they own that 
						money and can decide what to with it, they can keep it 
						for themselves or they can grant it to other people like 
						their brothers and sisters, and granting their money has 
						nothing to do with the ratio in which the heritage is 
						given to the inheritors, for this giving is done after 
						they have received their shares.
						 
						
						If you have questions 
						regarding the difference between men's and women's 
						inheritance you can refer to this site to find your 
						answers: Question 
						2207 can 
						especially be helpful.
						 
						
						d) Although the mixing of 
						men and women is not allowed according to the traditions 
						and the Sira (lifestyle) of the prophet and his 
						household and the Holy Quran that calls both genders to 
						modesty in various verses[11], 
						but not all kinds of mixing is forbidden, for example 
						men and women can coexist in society if being together 
						does not cause sins.  Even 
						during the time of the prophet men and women would work 
						together for the progress of the society.  Verse 
						32 of Surah Ahzab can be good proof for such a 
						assertion, the verse says: "Wives of the Prophet, you 
						are not as other women, If you are god fearing, be not 
						abject in your speech, so that he in whose heart is 
						sickness may be lustful; but speak honorable words"[12]  We 
						must pay attention that the verse does not forbid 
						speaking to anyone who is not mahram, but it is 
						forbidding the kind of speech that may entail the 
						committing of sin, it goes the same about the physical 
						mixing between men and women, meaning that if the mixing 
						will lead to the committing of sins, then it is Haram.
						 
						
						As for the mixing of men and 
						women in Hajj, since there is a lack of sufficient space 
						there for pilgrims, in order to solve the problem of the 
						mixing of men and women, different solutions are 
						possible:
						 
						
						First: In order to prevent 
						the mix of women and men the practice of this ritual 
						should be stopped!  Obviously 
						such an idea would be greatly challenged because of the 
						important role Hajj plays in Islam, and its social 
						effect and influence on the Muslim community through out 
						the world.  This 
						ritual is so critical that Islam says in the case of the 
						people not wanting to go, the leaders of Muslim 
						countries are responsible to pay instead of them and use 
						force to send them to Hajj if they do not cooperate.[13]
						 
						
						Therefore no one can ask for 
						Hajj to be ceased just because their may be a mixing of 
						men and women.
						 
						
						Second: The next solution 
						would be to prevent one of the two genders (for example 
						women) from performing the pilgrimage, which does not 
						make sense either, because pilgrimage is just as much 
						essential for men as it is for women, to the extent that 
						women must make the trip to Mecca even without their 
						husband's permission if the Hajj has become wajib upon 
						them.[14]
						 
						
						Third: To separate the men 
						and women in a way that each group would do the ritual 
						in a special part of the mosque so that they won't be 
						forced to pass by each other or bump into each other 
						while performing tawaf, this is a good solution and it 
						has been put to practice in other places during hajj 
						like the tents in Mina and Arafat.  We 
						hope that the authorities of Hajj and Muslim scholars 
						will work hand in hand to take care of this problem.
						 
						
						But until this problem is 
						solved Muslims should be careful not to be tricked by 
						Satan in committing sins during Tawaf, obviously 
						participating in Hajj can not be considered permission 
						to touch one of the opposite sex, therefore what was a 
						sin before Hajj is still a sin during Hajj and Tawaf.  Some 
						pilgrims assume that men and women are considered 
						brothers and sisters during hajj, but the truth of the 
						matter is that none of the rulings regarding men and 
						women change during Hajj.  For 
						example there is a Hadith which says a woman was doing 
						tawaf and her hand and forearm were exposed for a 
						moment, a man that was doing tawaf behind her put his 
						hands on hers!  All 
						of a sudden and in miraculous way their hands stuck to 
						each other, eventually all of the other pilgrims stopped 
						and stared at the two of them.  The 
						governor of Mecca was informed and the ulema of the city 
						asked the governor to cut off the hand of the man.  Finally 
						they explained what had taken place to Imam Hossein 
						(that was in Mecca at the time also performing the 
						pilgrimage).  He 
						then raised his hands and prayed and supplicated for a 
						long time and walked to the woman and moved the man's 
						hand away from the woman's, the governor asked: "Should 
						I command my soldiers to cut off the man's hand?" The 
						Imam told them not to (and thought that Allah's (swt) 
						punishment was enough for him)"[15].
						 
						
						Therefore none of what was 
						mentioned in the question were actually a change of the 
						Islamic law.  We 
						must keep in mind that the flexibility of the rulings 
						and tenets in Islam is not only in harmony with their 
						eternal nature but rather makes it possible to carry 
						them out in different situations without causing changes 
						in the rulings.
						 
						
						Related question: Question 
						6967, Revocation of capital punishment and banning of 
						torture in Iran (website: 7091).
 
						
						
						 
						
							
								
								
								
								
								[1] Adopted 
								from: Religion, 
								Stability and Change, Question 10 (website: 
								209).
								
								
								
								
								[2] Nahl:106.
								
								
								
								
								[3] Hurr 
								Ameli, Muhammad ibn Hasan, Wasa’elul-Shia, 
								vol. 16, pg. 225, hadith 21423.
								
								
								
								
								[4] The 
								Civil Law Book (Iran), article 662.
								
								
								
								
								[5] Ibid, 
								articles 1111 and 1129.
								
								
								
								
								[6] Najafi, 
								Muhammad Hasan, Jawahirul-Kalam fi 
								Sharh Shara’iul-Islam, vol. 43, pg. 38; 
								Sheikh Saduq, Man 
								La Yahduruhul-Faqih, vol. 4, pg. 121, hadith 
								5250.
								
								
								
								
								[7] Najafi, 
								Muhammad Hasan, Jawahirul-Kalam, 
								vol. 43, pg. 39.
								
								
								
								
								[8] Majlisi, 
								Muhammad Baqir, Biharul-Anwar, 
								vol. 20, pg. 362.
								
								
								
								
								[9] Hurr 
								Ameli, Muhammad ibn Hasan, Wasa’elul-Shia, 
								vol. 1, pg. 271, chapter 10.
								
								
								
								
								[10] Nisa:11 
								and 12.
								
								
								
								
								[11] Such 
								as: Nur:30 and 31 and 60, Mu’minun:5, Ma’arij:29 
								etc.
								
								
								
								
								[12] Ahzab:32.
								
								
								
								
								[13] Hurr 
								Ameli, Muhammad ibn Hasan, Wasa’elul-Shia, 
								vol. 11, pp. 23-24, hadiths 14148 and 14149.
								
								
								
								
								[14] Ibid, 
								vol. 11, pg. 155, hadith 14511.
								
								
								
								
								[15] Ibid, 
								vol. 13, pg. 227, hadith 17613.