Narrated Abu Huraira: Allah's Apostle 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."
Hadith ReferenceSahih Bukhari / The Book of Adhan / Hadith: 694
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة