Doubt in Prayers 8item What is the duty of a person who forgets to perform a rak‘ah of his prayer and then remembers it in the last rak‘ah? For example, thinking first rak‘ah of his prayer to be the second one, he performs the third and the fourth rak‘ah; then in this last rak‘ah he realizes that it is really only the third rak‘ah. What should he do? Should a person pay heed to doubts that occur in nāfilah prayers (other than the doubt concerning the number of performed rak‘ahs)? For example, he is unaware whether he has done one prostration or two. Knowing that those who doubt excessively are not to pay heed to their doubts, what are they to do if the doubts occur during prayer? How can a person know the number of rak‘ahs of caution prayers he is liable to perform? (That is whether it is one rak‘ah or two). Does the prayer of a person become void if he mistakenly performs some parts of his prayer in the place of other parts, or looks away at some point during the prayer, or speaks by mistake? Do two prostrations of inadvertence become obligatory if a word of the dhikrs of the prayer, of the verses of the Holy Qur’an, or of the supplication of qunūt is mistakenly recited? A person in the third rak‘ah of his prayer doubts whether he has performed the qunūt or not. What should they do? Should he complete the prayer or should he break it when the doubt occurs? What is the religious duty of a person who realizes after a number of years that his worship was invalid, or doubts its correctness?