'O God' in the Bible

"You [are] my witnesses," {declares} Yahweh, "and my servant whom I have chosen so that you may know and believe {in} me and understand that I [am] he. No god was formed before {me}, and none shall be after me.

Thus says Yahweh, the king of Israel, and its redeemer, Yahweh of hosts: "I [am the] first, and I [am the] last, and there is no god besides me.

I [am] Yahweh, and there is none besides [me]; besides me there is no god. I gird you though you do not know me,

Thus says Yahweh: "The acquisition of Egypt and the merchandise of Cush and the Sabeans, tall men, shall pass over to you; they shall be yours, and they shall walk behind you. They shall pass over in chains, and they shall bow down to you; they will pray to you: 'Surely God [is] with you, and there is no [other]. Besides [him] [there is] no God.'"