Things on which Sajdah is allowed
1085. Sajdah should be performed on earth, and on those things which
are not edible nor worn, and on things which grow from earth (e.g. wood and
leaves of trees).
It is not permissible to perform Sajdah on things which are used as food or dress (e.g. wheat, barley and cotton etc.), or on things which are not considered to be parts of the earth (e.g. gold, silver, etc.). And in the situation of helplessness, asphalt and tar will have preference over other non-allowable things.
1086. Sajdah should not be performed on the vine leaves, when they are delicate and hence edible. Otherwise, there is no objection.
1087. It is in order to perform Sajdah on things which grow from the earth, and serve as fodder for animals (e.g. grass, hay etc.).
1088. It is in order to perform Sajdah on flowers which are not edible, and also on medicinal herbs which grow from the earth.
1089. Performing Sajdah on a grass which is eaten in some parts of the world, but not in the rest, but it is classified as edible, will not be permissible. Similarly, Sajdah on raw fruits is not allowed.
1090. It is allowed to perform Sajdah on limestone and gypsum, but the recommended precaution is that Sajdah should not be optionally performed on baked gypsum, lime, brick and baked earthenware etc.
1091. It is in order to perform Sajdah on paper, if it is manufactured from allowed sources like wood or grass, and also if it is made from cotton or flax. But if it is made from silk etc., Sajdah on it will not be permissible.
1092. Turbatul Husayn is the best thing for performing Sajdah. After it, there are earth, stone and grass, in order of priority.
1093. If a person does not possess anything on which it is allowed to
perform Sajdah, or, even if he possesses such a thing, he cannot perform Sajdah
on it due to severe heat or cold, he should perform Sajdah on asphalt or tar,
and if that is not possible, on his dress or the back of his hand, or on any
thing on which it is not permissible to perform Sajdah optionally.
However, in such a situation, the recommended precaution is that as long as it is possible to perform Sajdah on his dress he should not do Sajdah on any other thing.
1094. The Sajdah performed on mud, and on soft clay on which one's forehead cannot rest steadily, is void.
1095. If the mohr sticks to the forehead in the first Sajdah, it should be removed from the forehead for the second Sajdah.
1096. If a thing on which a person performs Sajdah gets lost while he is offering prayers, and he does not possess any other thing on which Sajdah is allowed, he can act as explained in rule 1093, irrespective of whether the time for Namaz is limited or ample.
1097. If a person realises in the state of Sajdah that he has placed
his forehead on a thing on which Sajdah is void, and if he becomes aware of
it after completing the obligatory Zikr, he can raise his head and continue
with his prayers.
But if he becomes aware of it before reciting the obligatory Zikr, he should gradually slide or move his head onto an allowed object, and recite the Zikr. But if that is not possible, he should recite the obligatory Zikr and continue with his namaz. His prayers in both cases will be valid.
1098. If a person realises after Sajdah, that he had placed his forehead on a thing which is not permissible for Sajdah, there is no objection.
1099. It is haraam to perform Sajdah for anyone other than Almighty Allah. Some people place their foreheads on earth before the graves of the holy Imams. If this is done to thank Allah, there is no harm in it, but otherwise it is haraam.