Sahih al-Bukhari Hadith 2 – Volume 6, Book 60

English

Volume 6, Book 60, Number 2:
Narrated Abu Huraira:
Allah's Apostle said, "When the Imam says: 'Ghair-il-Maghdubi 'Alaihim Walad-Dallin (i.e. not the
path of those who earn Your Anger, nor the path of those who went astray (1.7)), then you must say,
'Ameen', for if one's utterance of 'Ameen' coincides with that of the angels, then his past sins will be
forgiven."