'O God' in the Bible

and have cast their gods into the fire; for they were no gods, but the work of men's hands, wood and stone; and they have destroyed them.

Ye are my witnesses, saith Jehovah, and my servant whom I have chosen; that ye may know and believe me, and understand that I am HE: before me there was no God formed, neither shall there be after me.

Thus saith Jehovah, the King of Israel, and his Redeemer, Jehovah of hosts: I am the first, and I am the last, and beside me there is no God.

I am Jehovah, and there is none else; there is no God beside me: I girded thee, and thou hast not known me;

Verily thou art a God that hidest thyself, O God of Israel, the Saviour. ...

Declare and bring them near; yea, let them take counsel together: who hath caused this to be heard from ancient time? who hath declared it long ago? Is it not I, Jehovah? And there is no God else beside me; a just God and a Saviour, there is none besides me.

Yet they seek me daily, and delight to know my ways, as a nation that doeth righteousness, and hath not forsaken the ordinance of their God; they ask of me the ordinances of righteousness, they take delight in approaching to God: