Sahih Muslim Book 4, Hadith 77

The Messenger of Allah (ﷺ) said: SayAmin when the Imam says Amin, for it anyone's utterance of Amin synchronises with that of the angels, he will be forgiven his past sins.

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A hadith like this is narrated by Abu Huraira by another chain of transmitters.

Sahih Muslim Book 4, Hadith 76
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I heard from the Messenger of Allah (ﷺ) the hadith like one transmitted by Malik, but he made no mention of the words of Shihab.

Sahih Muslim Book 4, Hadith 78