Abu Hurairah reported the prophet (ﷺ) as saying; when the imam recites " not of those with whom you are angry, nor of those who go astray" (surah al-fatihah,verse 7) say Amin, for if one's words (utterance of amin) synchronise with those of the angles, he will be forgiven his past sins.
Reference: Sunan Abi Dawud 935 In-book : Book 2, Hadith 546 English translation : Book 2, Hadith 935
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