'O God' in the Bible

But the Angel of the LORD spake to Elijah the Tishbite, "Up, and go against the messengers of the king of Samaria and say unto them, 'Is it because there is no God in Israel, that ye go to ask through Beelzebub the god of Ekron?

And they said unto him, "There came a man against us and said unto us, 'Go and turn again unto the king that sent you, and say unto him: Thus sayeth the LORD. Is it because there is no God in Israel, that thou sendest to enquire through Beelzebub the god of Ekron? Therefore thou shalt not come down from the bed on which thou art gone up, but shalt surely die.'"

And he said unto the king, "Thus sayeth the LORD, 'Forasmuch as thou sentest messengers to ask through Beelzebub the god of Ekron - as though there had been no God in Israel to ask through his word - therefore thou shalt not come off the bed on which thou art ascended, but shalt surely die.'"

Then he turned again to the man of God and all his company with him, and came and stood before him and said, "Behold, I know that there is no God in all the world, but in Israel. And now, I pray thee, take a blessing of thy servant."

and have set fire on their gods. For they were no gods - but the work of the hands of man; even wood and stone. And therefore they destroyed them.