'O God' in the Bible

Has a nation changed [its] gods, which really are no gods? But my people have changed their glory for that which does not profit.

"How can I pardon you? Your children have forsaken me, and sworn by what are no gods. When I had fed them to the full, they committed adultery, and assembled themselves in troops at the prostitutes' houses.

Shall a man make to himself gods, which yet are no gods?