Abu Umama, or one of the companions of God’s Messenger, said that Bilal began the iqama, and when he said, “The time for prayer has come,” God’s Messenger said, “May God establish it and cause it to continue!” During the whole of the iqama he made such responses as are found in ‘Umar’s tradition about the adhan.
God’s Messenger taught me to say when the adhan for the sunset prayer was called, “O God, this is the time when Thy night comes on, Thy day retires, and the voices of Thy summoners are heard, so forgive me.”
Abu Dawud transmitted it, as did Baihaqi in ad-Da'awat al-kabir.
‘Uthman b. Abul ‘As said that he asked God's Messenger to make him his people’s imam and that he replied, “You are their imam, but do according to what the weakest of them is capable of, and employ a mu’adhdhin who does not accept payment for his adhan.”