Muwatta Malik, 193

Yahya related to me from Malik from Ibn Shihab that Sa'id ibn al- Musayyab and Abu Salama ibn Abd ar-Rahman told him from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "When the imam says 'Amin', say 'Amin', for the one whose 'Amin' coincides with the 'Amin' of the angels - his previous wrong actions are forgiven him." Ibn Shihab said, "The Messenger of Allah, may Allah bless him and grant him peace, used to say 'Aameen' (extending it)

Abou Houraira a rapporté que l'Envoyé d'Allah (salallahou alayhi wa salam) r (Sur lui la grâce et la paix d'Allah) a dit: «quand l'imam dit «Amin», dites Amin car celui qui fait correspondre son «Amin», à celui que disent les anges, ses fautes antérieures lui seront pardonnées». Ibn Chéhab a dit: «L'Envoyé d'Allah (salallahou alayhi wa salam) (Sur lui la grâce et la paix d'Allah) disait «Amin» »