'Servant of God' in the Bible

Paul, a servant of God, and an apostle of Jesus Christ, according to the faith of the choice ones of God, and an acknowledging of truth that is according to piety,

and they sing the song of Moses, servant of God, and the song of the Lamb, saying, 'Great and wonderful are Thy works, O Lord God, the Almighty, righteous and true are Thy ways, O King of saints,