Hadith 10:110
Narrated Abu Huraira:
The Prophet (ﷺ) prayed two rak`at of Zuhr prayer (instead of four) and he was told that he had prayed two rak`at only. Then he prayed two more rak`at and finished them with the Taslim followed by two prostrations.
حَدَّثَنَا أَبُو الْوَلِيدِ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ سَعْدِ بْنِ إِبْرَاهِيمَ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ صَلَّى النَّبِيُّ صلى الله عليه وسلم الظُّهْرَ رَكْعَتَيْنِ، فَقِيلَ صَلَّيْتَ رَكْعَتَيْنِ. فَصَلَّى رَكْعَتَيْنِ، ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ
Original Reference: Sahih al-Bukhari 715