'O God' in the Bible

so that he has an uninterrupted power to save those, that come to God by him, because he ever lives to make intercession for them.

how much more shall the blood of Christ, who through the holy spirit offered himself a spotless victim to God, purify our souls from deadly sins, to serve the living God?

then said I, lo I come, as in the volume of the book it is written of me, to do thy will, O God."

he immediately adds, "lo, I come to do thy WILL, O God." he abolishes the first to establish the second:

'Twas by faith that Abel offered unto God a more excellent sacrifice than Cain, by which he was declared righteous, God himself having testified that he accepted his offering, and after he died for his faith, he was not silent.

now without faith it is impossible to be acceptable to him: for he that presents himself to God, cannot but believe he exists, and that he is a rewarder of those who make their addresses to him.

the church of the first-born who are enroll'd in heaven, to God the judge of all, to the spirits of just men made perfect,

Let our sacrifice then, which we are to offer to God by Jesus Christ, be that of incessant praises, the offering of our lips, which celebrate his name:

but don't forget to be beneficent to the community; for such sacrifice is acceptable to God.