Sunan Ibn Majah

"The Messenger of Allah (saw) prayed, and he added or omitted something." (One of the narrators) Ibrahim said: "The confusion stems from me (i.e., he was not sure which it was)." "It was said to him: 'O Messenger of Allah! Has something been added to the prayer?' He said: 'I am only human, I forget just as you forget. If anyone forgets, let him perform two prostrations when he is sitting (at the end).' Then the Prophet (saw) turned and prostrated twice." Hasan
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that he asked Abu Said Al-Khudri: "One of us prays and he does not know how many (Rakah) he has prayed." He said: "The Messenger of Allah (saw) said: 'When anyone of you prays and does not know how many he has prayed, let him perform two prostrations while he is sitting.'" Daif
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"(Once) the Prophet (saw) prayed Zuhr with five Rakah, and it was said to him: 'Has something been added to the prayer?' He said: 'What is that?' They told him, and he turned back towards the Qiblah and performed two prostrations." Sahih
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"The Prophet (saw) offered prayer, I think it was the 'Asr, and in the second Rakah he stood up before he sat. Before he said the Salam, he prostrated twice." Hasan
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that Ibn Buhainah told him that the Prophet (saw) stood up in the second Rakah of Zuhr and forgot to sit. When he had finished his prayer, and before he said the Salam, he performed the two prostrations for forgetfulness (Sahw) and said the Salam. Sahih
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"The Messenger of Allah (saw) said: 'If anyone of you stands after two Rakah, if he has not yet stood up fully, let him sit down again, but if he has stood up fully, then let him not sit down, and let him perform two prostrations for forgetfulness (Sahw).'" Sahih
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"I heard the Messenger of Allah (saw) say: 'If anyone of you is uncertain as to whether he has prayed one or two Rakah, let him assume it is one. If he is uncertain as to whether he has prayed two or three, let him assume it is two. If he is uncertain as to whether he has prayed three or four, let him assume it is three. Then let him complete what is left of his prayer, so that the doubt will be about what is more. Then let him prostrate twice while he is sitting, before the Taslim (saying the Salam).'" Sahih
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"The Messenger of Allah (saw) said: 'If anyone of you is uncertain about his prayer, let him put aside uncertainty and act upon that which is certain. When he has made sure his prayer is complete, then let him prostrate twice. Then if his prayer was complete, that (extra) Rakah will be counted as voluntary, and if his prayer was lacking, that Rakah will complete his prayer, and the two prostrations will rub the Satan's nose in the dust.'" Sahih
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"The Messenger of Allah (saw) offered prayer, and I am not sure whether he did something extra or omitted something. He asked, and we told him, so he turnd to face the Qiblah and prostrated twice, then he said the Salam. Then he turned to face us and said: 'If any new command has been revealed concerning the prayer, I would certainly have told you. But I am only human and I forget and you forget. If I forget, then remind me. And if anyone of you is uncertain about the prayer, let him do what is closest to what is correct, then complete the prayer, say the Salam and prostrate twice."
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"The Messenger of Allah (saw) said: 'If anyone of you is uncertain about his prayer, let him try to do what is correct then let him prostrate twice.'" Sahih
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