'O God' in the Bible

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

For they themselves witness what kind of entrance we had to you, even how you turned from idols to God in order to serve the living and true God,

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

For if we believe that Jesus died and rose again, even so God will also bring with Him all those who have fallen asleep through Jesus.