'Servant' in the Bible

I give praise to God, whose servant I have been, with a heart free from sin, from the time of my fathers, because in my prayers at all times the thought of you is with me, night and day

For it is not right for the Lord's servant to make trouble, but he is to be gentle to all, ready in teaching, putting up with wrong,

And so they may get themselves free from the net of the Evil One, being made the prisoners of the Lord's servant, for the purpose of God.