كتاب الافتتاح
11  
The Book of the Commencement of the Prayer
(34)
Chapter: The command to say Amin behind the Imam
(34)
باب الأَمْرِ بِالتَّأْمِينِ خَلْفَ الإِمَامِ
Sunan an-Nasa'i 929
It was narrated that Abu Hurairah, may Allah be pleased with him, that:
The Messenger of Allah (ﷺ) said: "When the Imam says: Not (the way) of those who earned Your anger, nor of those who went astray, say: 'Amin,' for if a person's Amin coincides with the Amin of the angels, his previous sins will be forgiven.'"
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ سُمَىٍّ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ، - رضى الله عنه - أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ إِذَا قَالَ الإِمَامُ ‏{‏ غَيْرِ الْمَغْضُوبِ عَلَيْهِمْ وَلاَ الضَّالِّينَ ‏}‏ فَقُولُوا آمِينَ فَإِنَّهُ مَنْ وَافَقَ قَوْلُهُ قَوْلَ الْمَلاَئِكَةِ غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ ‏"‏ ‏.‏
Grade: Sahih (Darussalam)
Reference : Sunan an-Nasa'i 929
In-book reference : Book 11, Hadith 54
English translation : Vol. 2, Book 11, Hadith 930