'O God' in the Bible

And Moses said to God, Who am I to go to Pharaoh and take the children of Israel out of Egypt?

And he said, Truly I will be with you; and this will be the sign to you that I have sent you: when you have taken the children of Israel out of Egypt, you will give worship to God on this mountain.

And Moses said to God, When I come to the children of Israel and say to them, The God of your fathers has sent me to you: and they say to me, What is his name? what am I to say to them?

So Moses went out of the town, and stretching out his hands made prayer to God: and the thunders and the ice-storm came to an end; and the fall of rain was stopped.

And when Pharaoh came near, the children of Israel, lifting up their eyes, saw the Egyptians coming after them, and were full of fear; and their cry went up to God.

Then Jethro, Moses' father-in-law, made a burned offering to God: and Aaron came, with the chiefs of Israel, and had a meal with Moses' father-in-law, before God.

And Moses went up to God, and the voice of the Lord came to him from the mountain, saying, Say to the family of Jacob, and give word to the children of Israel:

But Moses made prayer to God, saying, Lord, why is your wrath burning against your people whom you took out of the land of Egypt, with great power and with the strength of your hand?

Make for yourselves no gods of metal.