Wa’il b. Hujr said that he heard God’s Messenger recite, “Not of those with whom Thou art angry, nor of those who go astray” (Al-Qur’an 1:7) and say “Amen”, prolonging the word.
Tirmidhi, Abu Dawud, Darimi and Ibn Majah transmitted it.
We went out with God’s Messenger one night and came upon a man who made supplication with persistence. The Prophet said, “He will have done something which guarantees if he puts a seal to it.” One of the people asked what he should use for a seal, and he replied, “Amen”.
Ibd ‘Abbas said that God’s Messenger used to recite in both rak'as of the dawn prayer, “Say, We believe in God and in the revelation given to us,”1 and the verse in Al 'Imran, “Say, O people of the Book, come to common terms between us and you.”2