'O God' in the Bible

but as to the Son, Thy throne, O God, is to the age of the age, and a sceptre of uprightness is the sceptre of thy kingdom.

Wherefore it behoved him in all things to be made like to his brethren, that he might be a merciful and faithful high priest in things relating to God, to make propitiation for the sins of the people;

For every high priest taken from amongst men is established for men in things relating to God, that he may offer both gifts and sacrifices for sins;

(for the law perfected nothing,) and the introduction of a better hope by which we draw nigh to God.

Whence also he is able to save completely those who approach by him to God, always living to intercede for them.

how much rather shall the blood of the Christ, who by the eternal Spirit offered himself spotless to God, purify your conscience from dead works to worship the living God?

Then I said, Lo, I come (in the roll of the book it is written of me) to do, O God, thy will.

By faith Abel offered to God a more excellent sacrifice than Cain, by which he obtained testimony of being righteous, God bearing testimony to his gifts, and by it, having died, he yet speaks.

But without faith it is impossible to please him. For he that draws near to God must believe that he is, and that he is a rewarder of them who seek him out.

the universal gathering; and to the assembly of the firstborn who are registered in heaven; and to God, judge of all; and to the spirits of just men made perfect;

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