'O God' in the Bible

And Solomon will say to God, Thou didst great mercy with David my father, and hast caused me to reign in his stead.

Did ye not thrust out the priests of Jehovah, the sons of Aaron and the Levites? and ye will make to you priests according to the peoples of the lands, every one coming to fill his hand with a bullock, son of the cow, and seven rams; and he was priest to no God.

And he will say, Attend all Judah, and ye inhabitants of Jerusalem, and thou, king Jehoshaphat. Thus said Jehovah to you, Ye shall not fear, and ye shall not be terrified from the face of this great multitude; for not to you the battle but to God.