710. If a person leaves out even a small part of his forehead or the back of his hands in tayammum, forgetfully or intentionally, or even due to ignorance, his tayammum will be void. However, it is not necessary to be very particular; if it can be ordinarily assumed that the forehead and the backs of the hands have been wiped, it would be sufficient.
711. In order to be sure that the backs of the hands have been wiped, wiping should be done from slightly above the wrist, but wiping in between the fingers is not necessary.
712. The forehead and the backs of the hands should be wiped downwards from above, and their acts should be performed one after the other without undue interruption. If someone interrupts the sequence so much that it could not be said that he is doing tayammum, then tayammum will be void.
713. It is necessary to determine while making Niyyat that a particular tayammum is instead of Wudhu or particular Ghusl(Janabat,Hayz,…). However, if he does not know that which one is obligatory upon him, it is sufficient to make the niyyat that he is acting to discharge his religious obligation.
714. As an obligatory precaution the forehead, the palm of the hands and the backs of the hands of a person wishing to do tayammum should be Pak.
715. While performing tayammum one should remove the ring one is wearing and
also remove any obstruction which may be on his forehead or on the palms or back of his hands (e.g. if anything is stuck on them).
716. If a person has a wound on his forehead or on the back of his hands and if it is tied with a bandage or something else, which cannot be removed, he should wipe his hands over it. And if the palm of his hand is wounded and, bandaged in a way that it cannot be removed, he should strike his bandaged hands on a thing with which it is permissible to perform tayammum and then wipe his forehead and the back of his hands.
717. There is no harm if there is hair on the forehead or on the back of hands. However, if the hair of his head fall on his forehead then it should be pushed back.
718. If one feels that one has some obstruction on his forehead or on the palm or back of his hands, an obstruction commonly known to be so, then one should erify and ensure that the obstruction is removed.
720. If a man doubts while performing tayammum whether or not he has forgotten a certain part of it, he should ignore his doubt, he should perform that part and the parts after that.
721. If, after wiping the left hand, a man doubts whether or not he has performed his tayammum correctly his tayammum is valid.
722. A person whose obligation is tayammum, he can not do tayammum for Namaz before the time of Namaz. However, if he performs tayammum for some other obligatory or Mustahab act and his excuse (on account of which his religious obligation is tayammum) continues till the time for prayers sets in, he can offer his prayers with that tayammum.
723. If a person whose obligation is Tayammum, knows that his excuse will continue till the end of the time of Namaz, he can offer prayers with Tayammum even during the early part of the time. But, if he knows that his excuse will cease to exist by the end of the time, he should wait and offer prayers with Wudhu or Ghusl as the case may be. and also if he hopes that his excuse will cease to exist by the end of the time, he should wait and offer prayers with Wudhu or Ghusl or prays with tayammum if there is not enough time.
725. It is permissible for a person, who cannot do Ghusl or Wudhu, to offer with tayammum the daily Mustahab prayers for which the time is fixed. However, if he has hope that his excuse may cease to exist before the time for prayers is over then, he should not offer the Mustahab prayers during the earlier part of their time.
727. If a person performs tayammum on account of non-availability of water or because of some other excuse his tayammum becomes void as soon as that excuse ceases to exist.
728. The things which invalidate Wudhu invalidate the tayammum performed instead of Wudhu also. Similarly, the things which invalidate Ghusl invalidate the tayammum performed instead of Ghusl also.
729. If one has upon him several wajib Ghusls, but he cannot do them, it is permissible for him to perform one tayammum instead of all those Ghusls, but the recommended precaution is that for each of those Ghusls he should perform a separate tayammum.
730. If a person who cannot do Ghusl wishes to perform an act for which Ghusl is obligatory, he should perform tayammum for Ghusl. And a person who cannot perform Wudhu wishes to perform an act for which Wudhu is obligatory, he should perform tayammum instead of Wudhu.