(18) باب التَّسْمِيعِ وَالتَّحْمِيدِ وَالتَّأْمِينِ
Abu Huraira reported:
The Messenger of Allah (ﷺ) said: SayAmin when the Imam says Amin, for it anyone's utterance of Amin synchronises with that of the angels, he will be forgiven his past sins. (JA)
Reference (JA): Sahih Muslim 410 a (JA)
In-book reference (JA): Book 4, Hadith 77 (JA)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 811 (JA)