Sahih Bukhari

Narrated `Abdullah:The Prophet (ﷺ) led us in Zuhr prayer and prayer five rak`at. Somebody asked him whether the prayer had been increased."" He (the Prophet (ﷺ) ) said, ""And what is that?"" They (the people) replied, ""You have prayed five rak`at."" Then the Prophet (ﷺ) offered two prostrations (of Sahu) after he had finished his prayer with the Taslim