the Prophet, and it is similar to the narrations of Sufyan from Salamah bin Kuhail
Jami` at-Tirmidhi Book 2, Hadith 101
← Previous Hadith "I heard the Prophet recite: (Not (the way) of those who earned Your anger, nor those who went astray) and he said: 'Amin.' And he stretched it out with his voice."

Jami` at-Tirmidhi Book 2, Hadith 100 Next Hadith → the Prophet said "When the Imam says 'Amin' then (all of you) say 'Amin.' For whoever's 'Amin' concurs with the 'Amin' of the angels, then his past sins will be forgiven."

Jami` at-Tirmidhi Book 2, Hadith 102