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Sahih Muslim, Volume 1 The book of Prayer (Al-Salat)

Sahih Muslim, Vol. 1, Book II, Chapter CLXVI, P.225

(809) Abu Huraira reported: The Messenger of Allah, peace be upon him, said: When the Imam says: “Allah listens to him who praises Him.” You should say: “O Allah, Our Lord, for Thee is the praise.” For it what anyone says synchronizes with what the angels say, his past sins will be forgiven.