1 Corinthians 9:17-19
Good News Translation
17 If I did my work as a matter of free choice, then I could expect to be paid; but I do it as a matter of duty, because God has entrusted me with this task. 18 What pay do I get, then? It is the privilege of preaching the Good News without charging for it, without claiming my rights in my work for the gospel.
19 I am a free man, nobody's slave; but I make myself everybody's slave in order to win as many people as possible.Read full chapter