'O God' in the Bible

And Adoni-bezek said, seventy kings, having their thumbs and their great toes cut off, gathered their food under my table; as I have done, so God hath requited me. And they brought him to Jerusalem, and there he died.

So God subdued on that day Jabin the king of Canaan before the children of Israel.

And Gideon said to God, If thou wilt save Israel by my hand, as thou hast said,

And Gideon said to God, Let not thy anger be hot against me, and I will speak but this once: Let me make trial, I pray thee, but this once with the fleece; let it now be dry only upon the fleece, and upon all the ground let there be dew.

For lo, thou shalt conceive, and bear a son; and no razor shall come on his head: for the child shall be a Nazarite to God from his birth: and he shall begin to deliver Israel from the hand of the Philistines.

But he said to me, Behold, thou shalt conceive, and bear a son; and now drink no wine nor strong drink, neither eat any unclean thing: for the child shall be a Nazarite to God from his birth to the day of his death.

That he told her all his heart, and said to her, There hath not come a razor upon my head; for I have been a Nazarite to God from my birth: if I be shaved, then my strength will go from me, and I shall become weak, and be like any other man.

And Samson called to the LORD, and said, O Lord GOD, remember me, I pray thee, and strengthen me, I pray thee, only this once, O God, that I may be at once avenged of the Philistines for my two eyes.