Hadith; If imam makes a mistake (in the prayer) then you will receive the reward for the prayer and the sin will be his.

Bismillahirrahmanirrahim

Hadith; If imam makes a mistake (in the prayer) then you will receive the reward for the prayer and the sin will be his.

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✦ Narrated Abu Huraira Radhi allahu anhu Allah's Messenger Sal-Allahu Alaihi Wasallam said, The imam leads you in prayer, 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." 

Sahih Bukhar : Vol. 1, Book 11, Hadith 663