1 Corinthians 9:7-11

7Who serves as a soldier at his own expense? Who plants a vineyard without eating any of its fruit? Or who tends a flock without getting some of the milk? 8Do I say these things on human authority? Does not the Law say the same? 9For it is written in the Law of Moses, “You shall not muzzle an ox when it treads out the grain.” Is it for oxen that God is concerned? 10Does he not certainly speak for our sake? It was written for our sake, because the plowman should plow in hope and the thresher thresh in hope of sharing in the crop. 11If we have sown spiritual things among you, is it too much if we reap material things from you?