'O God' in the Bible

We give thanks to God always for you all, making mention of you in our prayers;

For they publish concerning you what manner of entrance we had unto you, and how ye turned unto God from idols, to serve the living and true God,

For this cause do we also give thanks to God unceasingly, because when ye received the word reported by us from God, ye received it not as the word of man, but, as it is in truth, the word of God, which worketh also effectually in you that believe.

For what sufficient thanks can we render to God for you, for all the joy with which we rejoice on your account before our God,