'O God' in the Bible

whether the Gentiles themselves deal so falsely and untruly with their gods - which yet are no gods indeed! But my people hath given over their high honour, for a thing that may not help them.

"Should I then, for all this, have mercy upon thee? Thy children have forsaken me, and sworn by them that are no gods. And albeit they were bound to me in marriage, yet they fell to adultery, and hunted harlots' houses.

but seek after peace and prosperity of the city wherein ye be prisoners, and pray unto God for it. For in the peace thereof, shall your peace be.

but they shall do service unto God their LORD, and to David their king, whom I will raise up unto them.

Then Jeremiah the Prophet said unto them, "I have heard you. Behold, I will pray unto God your LORD, as ye have required me: and look what answer the LORD giveth you, I shall certify you thereof, and keep nothing back from you."