'O God' in the Bible

"Then you shall go on forward from there, and you shall come to the oak of Tabor; and three men shall meet you there going up to God to Bethel, one carrying three young goats, and another carrying three loaves of bread, and another carrying a bottle of wine:

Saul said, "Let us go down after the Philistines by night, and take spoil among them until the morning light, and let us not leave a man of them." They said, "Do whatever seems good to you." Then the priest said, "Let us draw near here to God."