'O God' in the Bible

but to the Son, "Thy throne, O God, is for ever and ever; the sceptre of thy kingdom is a sceptre of righteousness:

For every high-priest taken from among men, is appointed for the sake of men in things relating to God, that he may offer gifts and sacrifices for sins:

for the law made nothing perfect, but the introducing of a better hope did, by which we draw near to God.

wherefore also He is able to save to the uttermost, those that come unto God by Him, seeing He ever liveth to make intercession for them.

how much more shall the blood of Christ, who through the eternal Spirit offered himself spotless to God, purify your conscience from dead works, that ye may 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."

"Lo I come to do thy will, O God." (He taketh away the first, that He may establish the second.)

By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained the testimony that he was righteous, God bearing witness to his gifts: and by it, though dead, he yet speaketh.

whereas without faith it is impossible to please Him; for he that cometh to God must believe, that He is, and is the rewarder of them that diligently seek Him.

to the general assembly and church of the first-born who are written in heaven, and to God the judge of all, and to the spirits of the just made perfect,

By him therefore let us offer the sacrifice of praise to God continually, that is, the fruit of our lips giving thanks to his name.