It was narrated that Abu Hurairah said: “The Messenger of Allah صلی اللہ علیہ وآلہ وسلم said: ‘When the reciter says Amin, then say: “Amin” too, for the angels say Amin and if a person’s Amin coincides with the Amin of the angels, Allah will forgive his previous sins.” (Sahih)