'Church of God' in the Bible

to the church of God at Corinth, to those who are consecrated by union with Christ Jesus, and called to be God's people, in fellowship with those who anywhere call upon the name of Jesus Christ, their Lord and ours:

Stop being stumbling blocks to Jews or Greeks or to the church of God,

It is not that you have no houses to eat and drink in, is it? Or, are you trying to show your contempt for the church of God and trying to humiliate those who have no houses? What shall I say to you? Shall I praise you? No, I cannot praise you for this.

For I belong to the lowest rank of the apostles, and am not fit to bear the title apostle, because I once persecuted the church of God.