'O God' in the Bible

We give thanks to God always for all of you, continually mentioning you in our prayers;

For they themselves report about us, telling what kind of reception we had among you, and how you turned to God from idols to serve the living and true God,

who killed both the Lord Jesus and the prophets, and harassed and drove us out; and [they] continue to be highly displeasing to God and [to show themselves] hostile to all people,

For what [adequate] thanks can we offer to God for you in return for all the joy and delight we have before our God on your account?

For if we believe that Jesus died and rose again [as in fact He did], even so God [in this same way—by raising them from the dead] will bring with Him those [believers] who have fallen asleep in Jesus.

Now may the God of peace Himself sanctify you through and through [that is, separate you from profane and vulgar things, make you pure and whole and undamaged—consecrated to Him—set apart for His purpose]; and may your spirit and soul and body be kept complete and [be found] blameless at the coming of our Lord Jesus Christ.