'O God' in the Bible

They sacrificed unto demons, which were no God, To gods that they knew not, To new gods that came up of late, Which your fathers dreaded not.

See now that I, even I, am he, And there is no god with me: I kill, and I make alive; I wound, and I heal; And there is none that can deliver out of my hand.

There is none like unto God, O Jeshurun, Who rideth upon the heavens for thy help, And in his excellency on the skies.