1 Corinthians 9:17-18

17If I were doing this work because I chose to do it, I would receive my pay. But I myself did not choose to do it. God has given me this work, so I have to do it.

18So what kind of pay do I receive? It is this: I do not take any money from people when I tell them God's good news. I do not use all the authority that I could use when I tell God's good news to people.