'O God' in the Bible

Also I shook my lap, and said, So God shake out every man from his house and from his earnings, that performeth not this promise: even thus be he shaken out and emptied! And all the congregation said, Amen! And they praised Jehovah. And the people did according to this promise.

For of old, in the days of David and Asaph, there were the chiefs of the singers, and songs of praise and thanksgivings to God.