'O God' in the Bible

"O Lord who commands armies, O God of Israel, who is enthroned on the cherubim! You alone are God over all the kingdoms of the earth. You made the sky and the earth.

You are my witnesses," says the Lord, "my servant whom I have chosen, so that you may consider and believe in me, and understand that I am he. No god was formed before me, and none will outlive me.

This is what the Lord, Israel's king, says, their protector, the Lord who commands armies: "I am the first and I am the last, there is no God but me.

I am the Lord, I have no peer, there is no God but me. I arm you for battle, even though you do not recognize me.

I do this so people will recognize from east to west that there is no God but me; I am the Lord, I have no peer.

Yes, you are a God who keeps hidden, O God of Israel, deliverer!

Tell me! Present the evidence! Let them consult with one another! Who predicted this in the past? Who announced it beforehand? Was it not I, the Lord? I have no peer, there is no God but me, a God who vindicates and delivers; there is none but me.