The Messenger of Allah (ﷺ) said: "If any one of you says: 'Amin' and the angels in Heaven say Amin, and the one coincides with the other, his previous sins will be forgiven."
Reference: Sunan an-Nasa'i 930 In-book : Book 11, Hadith 55 English translation : Vol. 2, Book 11, Hadith 931
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