'O God' in the Bible

but of the Son he saith, Thy throne, O God, is for ever and ever; And the sceptre of uprightness is the sceptre of thy kingdom.

Wherefore it behooved him in all things to be made like unto his brethren, that he might become a merciful and faithful high priest in things pertaining to God, to make propitiation for 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), and a bringing in thereupon of a better hope, through which we draw nigh unto God.

Wherefore also he is able to save to the uttermost them that draw near unto God through 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 blemish unto God, cleanse your conscience from dead works to serve the living God?

Then said I, Lo, I am come (In the roll 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, through which he had witness borne to him that he was righteous, God bearing witness in respect of his gifts: and through it he being dead yet speaketh.

By faith Enoch was translated that he should not see death; and he was not found, because God translated him: for he hath had witness borne to him that before his translation he had been well-pleasing unto God:

And without faith it is impossible to be well-pleasing unto him ; for he that cometh to God must believe that he is, and that he is a rewarder of them that seek after him.

to the general assembly and church of the firstborn who are enrolled in heaven, and to God the Judge of all, and to the spirits of just men made perfect,

Wherefore, receiving a kingdom that cannot be shaken, let us have grace, whereby we may offer service well-pleasing to God with reverence and awe:

Through him then let us offer up a sacrifice of praise to God continually, that is, the fruit of lips which make confession to his name.