2 Corinthians 1:1; 2 Corinthians 8:1; 2 Corinthians 8:18-19; 2 Corinthians 8:23-24; 2 Corinthians 11:8; 2 Corinthians 11:28; 2 Corinthians 12:13

1 Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother, To the church of God which is at Corinth with all the saints who are throughout Achaia:
1 Now, brethren, we wish to make known to you the grace of God which has been given in the churches of Macedonia,
18 We have sent along with him the brother whose fame in the things of the gospel has spread through all the churches; 19 and not only this, but he has also been appointed by the churches to travel with us in this gracious work, which is being administered by us for the glory of the Lord Himself, and to show our readiness,
23 As for Titus, he is my partner and fellow worker among you; as for our brethren, they are messengers of the churches, a glory to Christ. 24 Therefore openly before the churches, show them the proof of your love and of our reason for boasting about you.
8 I robbed other churches by taking wages from them to serve you;
28 Apart from such external things, there is the daily pressure on me of concern for all the churches.
13 For in what respect were you treated as inferior to the rest of the churches, except that I myself did not become a burden to you? Forgive me this wrong!