Narrated Abu Huraira:

The Prophet prayed two Rakat of Zuhr prayer (instead of four) and he was told that he had prayed two Rakat only. Then he prayed two more Rakat 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 ﷺ الظُّهْرَ رَكْعَتَيْنِ، فَقِيلَ صَلَّيْتَ رَكْعَتَيْنِ. فَصَلَّى رَكْعَتَيْنِ، ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيْنِ.