1 Corinthians 9:14-23

Even so did the Lord ordain that they that proclaim the gospel should live of the gospel. But I have used none of these things: and I write not these things that it may be so done in my case; for it were good for me rather to die, than that any man should make my glorying void. For if I preach the gospel, I have nothing to glory of; for necessity is laid upon me; for woe is unto me, if I preach not the gospel. For if I do this of mine own will, I have a reward: but if not of mine own will, I have a stewardship intrusted to me. What then is my reward? That, when I preach the gospel, I may make the gospel without charge, so as not to use to the full my right in the gospel. For though I was free from all men, I brought myself under bondage to all, that I might gain the more. And to the Jews I became as a Jew, that I might gain Jews; to them that are under the law, as under the law, not being myself under the law, that I might gain them that are under the law; to them that are without law, as without law, not being without law to God, but under law to Christ, that I might gain them that are without law. To the weak I became weak, that I might gain the weak: I am become all things to all men, that I may by all means save some. And I do all things for the gospel’s sake, that I may be a joint partaker thereof.