It was
narrated that ‘Abdullah said:
“The Messenger of Allah (ﷺ)
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
(ﷺ)
turned and prostrated twice.”