'O God' in the Bible

So God was good to the midwives, and the people multiplied, and became very mighty.

Now it came about in the course of those many days that the king of Egypt died. And the sons of Israel sighed because of the bondage, and they cried out; and their cry for help because of their bondage rose up to God.

So God heard their groaning; and God remembered His covenant with Abraham, Isaac, and Jacob.

But Moses said to God, “Who am I, that I should go to Pharaoh, and that I should bring the sons of Israel out of Egypt?”

Then Moses said to God, “Behold, I am going to the sons of Israel, and I will say to them, ‘The God of your fathers has sent me to you.’ Now they may say to me, ‘What is His name?’ What shall I say to them?”

Now listen to me: I will give you counsel, and God be with you. You be the people’s representative before God, and you bring the disputes to God,

Moses went up to God, and the Lord called to him from the mountain, saying, “Thus you shall say to the house of Jacob and tell the sons of Israel:

then his master shall bring him to God, then he shall bring him to the door or the doorpost. And his master shall pierce his ear with an awl; and he shall serve him permanently.