1 Corinthians 9:14-18
14 In the same way, the Lord has commanded that those who preach the gospel should receive their living from the gospel.
15 But 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. I would rather die than have anyone deprive me of this boast.
16 Yet when I preach the gospel, I cannot boast, for I am compelled to preach. Woe to me if I do not preach the gospel!
17 If I preach voluntarily, I have a reward; if not voluntarily, I am simply discharging the trust committed to me.
18 What then is my reward? Just this: that in preaching the gospel I may offer it free of charge, and so not make use of my rights in preaching it.