1 Corinthians 9:6-9

Or is it only Barnabas and I who have no right to stop doing manual labor [in order to support our ministry]? [Consider this:] Who at any time serves as a soldier at his own expense? Who plants a vineyard and does not eat its fruit? Or who tends a flock and does not use the milk of the flock? Do I say these things only from a man’s perspective? Does the Law not endorse the same principles? For it is written in the Law of Moses, “YOU SHALL NOT MUZZLE AN OX WHILE IT IS TREADING OUT THE GRAIN [to keep it from eating the grain].” Is it [only] for oxen that God cares? [Deut 25:4]