'O God' in the Bible

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

For from you sounded out the word of the Lord not only in Macedonia and Achaia, but also in every place your faith to God-ward is spread abroad; so that we need not to speak any thing.

For they themselves shew of us what manner of entering in we had unto you, and how ye turned to God from idols to serve the living and true God;

For what thanks can we render to God again for you, for all the joy wherewith we joy for your sakes before our God;