Sahih Muslim Book 4, Hadith 75

The Messenger of Allah (ﷺ) 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 if what anyone says synchronises with what the angels say, his past sins will be forgiven.

Previous Hadith

The Messenger of Allah (ﷺ) said: He who blesses me once, Allah would bless him ten times.

Sahih Muslim Book 4, Hadith 74
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A hadith like this is narrated by Abu Huraira by another chain of transmitters.

Sahih Muslim Book 4, Hadith 76