'O God' in the Bible

And Abraham said to God, Oh that Ishmael might live before thee!

And Abraham prayed to God, and God healed Abimelech, and his wife and his handmaids, and they bore children.

And they said to him, We have dreamt a dream, and there is no interpreter of it. And Joseph said to them, Do not interpretations belong to God? tell me your dreams, I pray you.

So God sent me before you to preserve you a remnant in the earth, and to save you alive by a great deliverance.