'O God' in the Bible

And they were helped against them, and the Hagrites were delivered into their hand, and all that were with them; for they cried to God in the battle, and he was entreated of them, because they put their trust in him.

And say ye, Save us, O God of our salvation, And gather us together and deliver us from the nations, To give thanks unto thy holy name, And to triumph in thy praise.

And this was a small thing in thine eyes, O God; but thou hast spoken of thy servant's house for a great while to come, and hast regarded me according to the estate of a man of high degree, O Jehovah God.

And David said unto God, I have sinned greatly, in that I have done this thing: but now, put away, I beseech thee, the iniquity of thy servant; for I have done very foolishly.

And David said unto God, Is it not I that commanded the people to be numbered? even I it is that have sinned and done very wickedly; but these sheep, what have they done? let thy hand, I pray thee, O Jehovah my God, be against me, and against my father's house; but not against thy people, that they should be plagued.

And his brethren, men of valor, were two thousand and seven hundred, heads of fathers houses , whom king David made overseers over the Reubenites, and the Gadites, and the half-tribe of the Manassites, for every matter pertaining to God, and for the affairs of the king.