'O God' in the Bible

For in the law of Moses has been written, Thou shalt not muzzle the mouth of the ox grinding. Is there not care to God for oxen?

To the lawless, as lawless, (not being lawless to God, but subject to the law to Christ,) that I might gain the lawless,

But, that what things they sacrifice the nations sacrifice to demons, and not to God: and I will not ye be partakers of demons.

Judge in yourselves: is it suitable for a woman to pray to God uncovered?

For he speaking in a tongue speaks not to men, but to God: (for none hears; and in the spirit he speaks mysteries.)

And if there be no interpreter, let him be silent in the church; and let him speak to himself, and to God.

Then the end, when he should deliver up the kingdom to God, and the Father; when he should leave unemployed every beginning and every authority and power.

And grace to God, giving us the victory by our Lord Jesus Christ.