Sahih al-Bukhari 715
Sahih al-Bukhari · Book 10: Call to Prayers (Adhaan) · Can the Imam depend on the people's saying if he is in doubt (about a certain matter)?
Narrated Abu Huraira:
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.
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.