'Servant' in the Bible

When he had come near the den, he called out to Daniel with a troubled voice. The king said to Daniel, “O Daniel, servant of the living God, has your God, whom you constantly serve, been able to rescue you from the lions?”

Yes, all Israel has transgressed Your law, even turning aside, not obeying Your voice; so the curse has been poured out on us and the oath which is written in the Law of Moses the servant of God, because we have sinned against Him.

Now therefore, our God, listen to (heed) the prayer of Your servant (Daniel) and his supplications, and for Your own sake let Your face shine on Your desolate sanctuary.

For how can such a [weakened] servant of my lord talk with such [a being] as my lord? For now there remains no strength in me, nor has any breath been left in me.”