(55) باب إِذَا لَمْ يُتِمَّ الإِمَامُ وَأَتَمَّ مَنْ خَلْفَهُ
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "If the Imam leads the prayer correctly then he and you will receive the rewards but if he makes a mistake (in the prayer) then you will receive the reward for the prayer and the sin will be his."
Reference: Sahih al-Bukhari 694
In-book reference: Book 10, Hadith 89
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 663