It was narrated that Abu Hurairah said:"The Messenger of Allah (ﷺ) said: 'When the Imam says: Not (the way) of those who earned Your anger, nor of those who went astray, say: 'Amin' for the angels say Amin and the Imam says Amin, and if a person's Amin coincides with the Amin of the angels, his previous sins will be forgiven

English translation · Sunan an-Nasa'i