'O God' in the Bible

And thou shalt go on forward from thence, and shalt come to the oak of Tabor, and there shall meet thee three men going up to God, to Bethel, one carrying three kids, and another carrying three cakes of bread, and another carrying a flask of wine.

And Saul said, Let us go down after the Philistines by night, and plunder them until the morning light, and let us not leave a man of them. And they said, Do whatsoever is good in thy sight. Then said the priest, Let us come near hither to God.

So and more also do God to the enemies of David, if I leave of all that is his by the morning light any male.