'Servant' in the Bible

When he came near to the den to Daniel, he cried with a lamentable voice; the king spoke and said to Daniel, Daniel, servant of the living God, is your God, whom you serve continually, able to deliver you from the lions?

Yes, all Israel have transgressed your law, turning aside, that they should not obey your voice: therefore the curse and the oath written in the law of Moses the servant of God has been poured out on us; for we have sinned against him.

Now therefore, our God, listen to the prayer of your servant, and to his petitions, and cause your face to shine on your sanctuary that is desolate, for the Lord's sake.

For how can the servant of this my lord talk with this my lord? for as for me, immediately there remained no strength in me, neither was there breath left in me.