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
← Previous Hadith the Prophet, and it is similar to the narrations of Sufyan from Salamah bin Kuhail

Jami` at-Tirmidhi Book 2, Hadith 101 Next Hadith → Samurah said: "there are two pauses that I preserved from Allah's Messenger." But Imran bin Husain rejected that and said: "We preserved one pause." "So we wrote to Ubayy bin Ka'b in Al-Madinah. Ubayy wrote that Samurah was correct." Sa'eed said: "We said to Qatadah: 'What are those two pauses?' He said: 'When he entered into his Salat, and when he finished his recitation.' Then he (Qatadah) said after that: 'And when he recited (Nor those who went astray.)' And he said: 'He liked to pause when he finished the recitation until he caught his breath.'"

Jami` at-Tirmidhi Book 2, Hadith 103