'O God' in the Bible

Then shall you go on forward from there, and you shall come to the oak of Tabor, and there shall meet you three men going up to God to Bethel, one carrying three kids, and another carrying three loaves of bread, and another carrying a skin 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 seems good unto you. Then said the priest, Let us draw near here unto God.