(69) باب هَلْ يَأْخُذُ الإِمَامُ إِذَا شَكَّ بِقَوْلِ النَّاسِ
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.
Reference: Sahih al-Bukhari 715
In-book reference: Book 10, Hadith 110
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 683