Sunan an-Nasa'i 1242

Suwayd ibn Nasr informed us; he said: ‘Abd Allah informed us, from Mis‘ar, from Mansur, from Ibrahim, from ‘Alqamah, from ‘Abd Allah, who said: The Messenger of Allah (ﷺ) prayed and added or omitted something. When he said the taslim, we said: “O Messenger of Allah, has something changed in the prayer?” He said: “If something had changed in the prayer, I would have informed you. Rather, I am only a human being; I forget just as you forget. So whoever among you is uncertain about his prayer, let him consider which is more likely to be correct and complete the prayer on that basis. Then let him say the taslim and prostrate twice.”