'O God' in the Bible

And Solomon said to God, Thou have shown great loving kindness to David my father, and have made me king in his stead.

And he said, O LORD, the God of Israel, there is no God like thee, in heaven, or on earth, who keep covenant and loving kindness with thy servants, who walk before thee with all their heart,

Now therefore let not Hezekiah deceive you, nor persuade you after this manner, neither believe ye him. For no god of any nation or kingdom was able to deliver his people out of my hand, and out of the hand of my fathers. How much