'O God' in the Bible

But the angel of Jehovah said to Elijah the Tishbite, Arise, go up to meet the messengers of the king of Samaria, and say unto them, Is it because there is no God in Israel, that ye go to inquire of Baal-zebub, the god of Ekron?

And they said unto him, There came up a man to meet us, and said unto us, Go, turn again unto the king that sent you, and say unto him, Thus saith Jehovah, Is it because there is no God in Israel, that thou sendest to inquire of Baal-zebub, the god of Ekron? therefore thou shalt not come down from the bed whither thou art gone up, but shalt surely die.

And he said unto him, Thus saith the LORD, Forasmuch as thou hast sent messengers to inquire of Baalzebub the god of Ekron, is it not because there is no God in Israel to inquire of his word? therefore thou shalt not come down off that bed on which thou art gone up, but shalt surely die.

And he returned to the man of God, he and all his company, and came, and stood before him: and he said, Behold, now I know that there is no God in all the earth, but in Israel: now therefore, I pray thee, take a blessing of thy servant.

And Joash said to the priests, All the silver from things dedicated to God, which is brought into the house of Jehovah, the silver from each man the silver of his valuation, all the silver that comes into any man's heart to bring to the house of Jehovah,

And have cast their gods into the fire: for they were no gods, but the work of men's hands, wood and stone: therefore they have destroyed them.