The Messenger of Allah (ﷺ) offered one of the afternoon prayers with five (rak'ahs), and it was said to him: "Has something been added to the prayer?" He said: 'Why are you asking?' They said: 'You prayed five.' He said: 'I am only human, I forget as you forget, and I remember as you remember.' Then he prostrated twice then ended his prayer.
Reference: Sunan an-Nasa'i 1259 In-book : Book 13, Hadith 81 English translation : Vol. 2, Book 13, Hadith 1260
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