1 Corinthians 9:14-18

14In the same way, the Lord has commanded that those who preach the gospel should receive their living from the gospel. 15But I have not used any of these rights. And I am not writing this in the hope that you will do such things for me, for I would rather die than allow anyone to deprive me of this boast. 16For when I preach the gospel, I cannot boast, since I am compelled to preach. Woe to me if I do not preach the gospel! 17If I preach voluntarily, I have a reward; if not voluntarily, I am simply discharging the trust committed to me. 18What then is my reward? Just this: that in preaching the gospel I may offer it free of charge, and so not make full use of my rights as a preacher of the gospel.