'O God' in the Bible

And Adoni-bezek said, Threescore and ten 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 he died there.

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

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

And Gideon said unto God, Let not thine anger be kindled 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 upon his head; for the child shall be a Nazirite unto God from the womb: and he shall begin to save Israel out of the hand of the Philistines.

but he said unto me, Behold, thou shalt conceive, and bear a son; and now drink no wine nor strong drink, and eat not any unclean thing; for the child shall be a Nazirite unto God from the womb to the day of his death.

And he told her all his heart, and said unto her, There hath not come a razor upon my head; for I have been a Nazirite unto God from my mother's womb: if I be shaven, then my strength will go from me, and I shall become weak, and be like any other man.

And Samson called unto Jehovah, and said, O Lord Jehovah, 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.