'Servant' in the Bible

As he approached where Daniel was in the pit, he cried out to him in a voice filled with anguish, "Daniel, servant of the living God, has your God, whom you serve constantly, been able to deliver you from the lions?"

And all Israel flouted your Law, turning aside from it and not obeying your voice. Because we've sinned against him, the curse has been poured upon us, along with the oath written in the Law of Moses the servant of God.

"So now, O God, listen to the prayer of your servant and to his requests, and look with favor on your desolate sanctuary, for the sake of the Lord.

So how can a servant of my lord talk with someone like you, sir? And as for me, there's no strength left in me, and I can hardly breathe.'