Apostolic Constitutions, Book VIII 39
1O God, who art faithful and true, who has mercy on thousands and ten thousands of them that love You, the lover of the humble, and the protector of the needy, of whom all things stand in need, for all things are subject to You; look down upon this Your people, who bow down their heads to You, and bless them with spiritual blessing. Keep them as the apple of an eye, preserve them in piety and righteousness, and vouchsafe them eternal life in Christ Jesus Your beloved Son, with whom glory, honour, and worship be to You and to the Holy Spirit, now and always, and for ever and ever. Amen. And let the deacon say: Depart in peace. And when the first-fruits are offered, the bishop gives thanks in this manner:—