Sahih al-Bukhari 694
Sahih al-Bukhari · Book 10: Call to Prayers (Adhaan) · If the Imam does not offer the Salat (prayer) perfectly and the followers offer it perfectly
Narrated Abu Huraira:
حَدَّثَنَا الْفَضْلُ بْنُ سَهْلٍ ، قَالَ حَدَّثَنَا الْحَسَنُ بْنُ مُوسَى الأَشْيَبُ ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ اللَّهِ بْنِ دِينَارٍ ، عَنْ زَيْدِ بْنِ أَسْلَمَ ، عَنْ عَطَاءِ بْنِ يَسَارٍ ، عَنْ أَبِي هُرَيْرَةَ ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " يُصَلُّونَ لَكُمْ، فَإِنْ أَصَابُوا فَلَكُمْ، وَإِنْ أَخْطَئُوا فَلَكُمْ وَعَلَيْهِمْ " .
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."