'O God' in the Bible

But unto the Son, Thy throne, O God, is for ever and ever; the sceptre of thy kingdom is a sceptre of righteousness:

Wherefore it behoved him to be made in all things like his brethren, that he might be a merciful and faithful high-priest, in things pertaining to God, to expiate the sins of the people.

For every high priest being taken from among men, is appointed for men in things pertaining to God, that he may offer both gifts and sacrifices for sins,

For the law made nothing perfect, but the bringing in of a better hope did, by which we draw nigh to God.

Wherefore he is able also, to save them to the uttermost who come to God thro' 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 without spot to God, purge our conscience from dead works, to serve the living God?

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

By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained a testimony that he was righteous, God testifying of his gifts; and by it, being dead he yet speaketh.

But without faith it is impossible to please him; for he that cometh to God, must believe that he is, and that he is a rewarder of them that diligently seek him.

and to an innumerable company, To the general assembly of angels, and to the church of the first born, who are inrolled in heaven, and to God the 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 our lips, giving thanks to his name.