'O God' in the Bible

Then Jesus took the cakes and having given praise to God, he gave them to the people who were seated, and the fishes in the same way, as much as they had need of.

If any man is ready to do God's pleasure he will have knowledge of the teaching and of where it comes from--from God or from myself.

So they sent a second time for the man who had been blind and they said to him, Give glory to God: it is clear to us that this man is a sinner.

But I am certain that, even now, whatever request you make to God, God will give it to you.

Jesus, being conscious that the Father had put everything into his hands, and that he came from God and was going to God,