'O God' in the Bible

If a man sins against a man, one may appeal to God on his behalf. But if a man sins against the Lord, who then will intercede for him?" But Eli's sons would not listen to their father, for the Lord had decided to kill them.

Then shalt thou go on forward from thence, and thou shalt come to the plain of Tabor, and there shall meet thee three men going up to God to Bethel, one carrying three kids, and another carrying three loaves of bread, and another carrying a bottle of wine:

Then Samuel told the people the requirements of the kingdom, and wrote them in a book and placed it before the Lord. And Samuel sent all the people away, each one to his home.

And so God helped Israel that day. And the battle continued until they came unto Bethaven.

And Saul said, Let us go down after the Philistines by night, and spoil them until the morning light, and let us not leave a man of them. And they said, Do whatsoever seemeth good unto thee. Then said the priest, Let us draw near hither unto God.

And Saul said unto Yahweh - O God of Israel! now set forth the truth. Then were, Jonathan and Saul, taken, and, the people, escaped.

So and more also do God unto the enemies of David, if I leave of all that pertain to him by the morning light any that pisseth against the wall.