"Once the Prophet (ﷺ) offered five rak`at in Zuhr prayer. He was asked, "Is there an increase in the prayer?" The Prophet (ﷺ) said, "And what is it?" They said, "You have prayed five rak`at.' So he bent his legs and performed two prostrations (of Sahu).
Reference: Sahih al-Bukhari 404 In-book : Book 8, Hadith 56 USC-MSA web (English) : Vol. 1, Book 8, Hadith 398 (deprecated)
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