Abu Huraira reported God's Messenger as saying,“When one of you stands up to pray the devil comes to him and confuses him so that he does not know how much he has prayed. If any of you has such an experience he should perform two prostrations during the period when he sits.”* * i.e. before pronouncing the taslim. (Bukhari and Muslim.)

‘Ata b. Yasar said that Abu Sa'id reported God’s Messenger as saying,“When one of you is in doubt aoout his prayer and does not know how much he has prayed, three or four rak'as, he should subtract what he is doubtful about and base his prayer on what he is sure of, then perform two prostrations before giving the salutation. If he has prayed five rak'as they will make his prayer an even number for him, and if he has prayed exactly four they will be a humbling for the devil.”Muslim transmitted it, and Malik transmitted it from ‘Ata’ in mursal form. In his version it says,“he will make it an even number by these two prostrations.”

‘Abdallah b. Mas'ud said that God’s Messenger prayed five rak'as in the noon prayer and was asked whether the prayer had been extended. He asked what they meant by that, and when they told him he had prayed five rak'as he made two prostrations after having given the salutation. In a version he said,“I am only a human being like you, foigetting just as you do; so when I forget remind me, and when any of you is in doubt about his prayer he should aim at what is correct and complete his prayer in that respect, then give the salutation and afterwards make two prostrations.”(Bukhari and Muslim.)

Ibn Sirin reported Abu Huraira as saying:God’s Messenger led us in one of the two evening ('ashiy)1 prayers. (Ibn Sirin said that Abu Huraira named it, but he had forgotten which, it was.) He led us in two rak'as and when he had given the salutation he got up, and going towards a piece of wood which was placed crosswise in the mosque, he leaned on it looking as if he were angry. He placed his right hand on his left, and intertwining his fingers, he placed his right cheek on the back of his left hand. Those who were first to come out of the doors of the mosque said,“The prayer has been shortened." Abu Bakr and ‘Umar were among the people, but they were too afraid to speak to him; but among them was a man with such long arms that he was called“The possessor of arms" (Dhulyadain) who asked,“Have you forgotten, Messenger of God, or has the prayer been shortened?”He replied,“I have neither forgotten, nor has it been shortened." He then asked whether things were as the possessor of arms had said, and when he was told that that was so he went forward and prayed what he had omitted. He then gave the salutation, then said“God is most great" and made his usual prostration or one a little longer, then raised his head and said“God is most great", then said“God is most great" and made his usual prostration or one a little longer, then raised his head and said“God is most great". He2 was often asked whether he then gave the salutation and he would say: I have been informed that ‘Imran b. Husain said he then gave the salutation. 1. ‘Ashiy generally means evening, but it also means the time between the declining of the sun after the meridian and sunset or morning, so the two prayers here mentioned are the noon (zuhr) prayer and the afternoon prayer. 2. i.e. Ibn Sirin (Bukhari and Muslim, the wording being Bukhari’s.) In another version given by both of them, instead of saying“I have neither forgotten nor has it been shortened”God’s Messenger said,“None of that has happened," to which he replied,“Some of it has, Messenger of God."

‘Abdallah ibn Buhaina said that the Prophet led them in the noon prayer, and when he stood up at the end of the first two rak'as and did not sit, the people stood up along with him. When he finished the prayer and the people expected him to give the salutation, he said“God is most great" while sitting and made two prostrations before giving the salutation. Then he gave it. (Bukhari and Muslim.)

‘Imran b. Husain said that the Prophet led them in prayer and forgot something, so he made two prostrations, then uttered the shahada, then gave the salutation. Tirmidhi transmitted it and said this is a hasan gharib tradition.

Al-Mughira b. Shu'ba reported God’s Messenger as saying,“When an imam stands up at the end of two rak'as, if he remembers before standing straight up he should sit down, but if he stands straight up he must not sit down, but perform the two prostrations of forgetfulness.”Abu Dawud and Ibn Majah transmitted it.

Imran b. Husain said that God’s Messenger prayed the afternoon prayer and gave the salutation at the end of three rak'as, then went into his house. A man called al-Khirbaq who had long arms got up and went to him, and addressing him mentioned to him what he had done. He came out angrily trailing his cloak, and when he came to the people he asked,“Is this man telling the truth?”When they told him that he was, he prayed a rak‘a, then gave the salutation, then made two prostrations, then gave the salutation. Muslim transmitted it.

‘Abd ar-Rahman b. ‘Auf said that he heard God’s Messenger say,“If any of you prays a prayer and is in doubt whether it is deficient, he should go on praying till he begins to wonder whether he has not prayed too much.”Ahmad transmitted it.

Ibn ‘Abbas said that the Prophet prostrated himself when an-Najm (Al-Qur'an; 53) was revealed, and the Muslims, the ploytheists, jinn and men prostrated themselves along with him. Bukhari transmitted it.