Volume 1, Book 8, Number 394:
Narrated ‘Abdullah:
The Prophet prayed (and the subnarrator Ibrahim said, “I do not know whether he prayed more or
less than usual”), and when he had finished the prayers he was asked, “O Allah’s Apostle! Has there
been any change in the prayers?” He said, “What is it?’ The people said, “You have prayed so much
and so much.” So the Prophet bent his legs, faced the Qibla and performed two prostrations (of Sahu)
and finished his prayers with Tasiim (by turning his face to right and left saying: ‘As-Sal –
amu’Alaikum-Warahmat-ullah’). When he turned his face to us he said, “If there had been anything
changed in the prayer, surely I would have informed you but I am a human being like you and liable
to forget like you. So if I forget remind me and if anyone of you is doubtful about his prayer, he
should follow what he thinks to be correct and complete his prayer accordingly and finish it and do
two prostrations (of Sahu).”