(32) بَابُ مَا جَاءَ فِي الْقِبْلَةِ، وَمَنْ لاَ يَرَى الإِعَادَةَ عَلَى مَنْ سَهَا فَصَلَّى إِلَى غَيْرِ الْقِبْلَةِ
Narrated `Abdullah:
"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 reference: Book 8, Hadith 56
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 8, Hadith 398