Yahya related to me from Malik from Abu'z Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "When one of you says 'Amin' and the angels in the sky say 'Amin' so that one coincides with the other, his previous wrong actions are forgiven him."
Muwatta Malik Book 3, Hadith 49
← Previous Hadith Yahya related to me from Malik from Sumayy, the mawla of Abu Bakr, from Abu Salih as Samman, from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "When the imam has said, 'not of those with whom You are angry nor of those who are in error,' say 'Amin', for the previous wrong actions of the one whose utterance coincides with that of the angels, are forgiven him."

Muwatta Malik Book 3, Hadith 48 Next Hadith → Yahya related to me from Malik from Sumayy, the mawla of Abu Bakr, from Abu Salih as-Samman from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "When the imam says, 'Allah hears whoever praises Him,' say 'O Allah! Our Lord, praise be toYou, 'for the previous wrong actions done by the one whose utterance coincides with that of the angels are forgiven."

Muwatta Malik Book 3, Hadith 50