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Shiavault - a Vault of Shia Islamic Books A Brief of Islamic Law Things On Which Sajdah Is Allowed Sajdah should be performed on earth, and on those things not edible nor worn, 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 whinch are not considered to be partsof the earth (e.g.golol, silver, etc.).
And in the situation of helplessness, pitch and tar will have preference over other nonallowable things. Sajdah should not be performed on the vine leaves, when they are delicate and hence edible. Otherwise, there is no objection. 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.). It is allowed to perform Sajdah on limestone and gypsum.
In fact, there is no objection also in performing Sajdah on baked gypsum, lime, pick and baked earthenware etc. 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 it is made from silk etc, Sajdah on it will not be permissible. In case of tissue (disposable handkercheif), Sajdah on it is order only when one is sure that it is made from allowed sources.
Turbat-ul-Husayn is the best thing for performing Sajdah. After it, there are earth, stone and grass, in order of priority. If the Turbah sticks to the forehead in the first Sajdah, it should be removed from the forhead for the second Sajdah. If a thing on which a person performs Sajdah gets lost while he is offering prayer, and he does not possess any other thing on which Sajdah is allowed, he can perform Sajdah on any other thing.
The Mustahab and Makruh Things in Sajdah It is Mustahab to say Takbir before going to Sajdah. A person who prays standing will do so after having stood up from Ruku, and a person who prays sitting will do so after having sat properly.
It is also recommended to place the nose on a Turbah, or on any other thing on which Sajdah is allowed; and to say Takbir, after every Sajdah, when the person has sat down and his body is composed; and when his body is steady after the first Sajdah, to say: `Astaghfiru-llaha rabbi wa atubu ilayh`; and to say `Allahu Akbar` for going into second Sajdah, when his body is steady; and to recite Salawat while in prostrations.