'Servant of God' in the Bible

Now we know that God heareth not sinners: but if any man be a servant of God, and do his will, him He heareth.

Paul a servant of God, and an apostle of Jesus Christ, for promoting the faith of God's chosen people, and the knowledge of the truth which is according to godliness:

James a servant of God and of the Lord Jesus Christ, to the twelve tribes in dispersion sendeth greeting.

And they sing the song of Moses the servant of God, and the song of the Lamb, saying, "Great and marvellous are thy works, Lord God almighty; just and true are thy ways, O king of saints: who should not fear thee,