Chapter 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Narrated Abu Huraira: Allah' s Messenger (ﷺ) 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."
Sahih al-Bukhari 4475