1 Corinthians 9:6-9

Or is it only I and Barnabas who lack the right to not work for a living? Who serves as a soldier at his own expense? Who plants a vineyard and does not eat its grapes? Who tends a flock and does not drink the milk? Do I say this merely on human authority? Doesn’t the Law say the same thing? For it is written in the Law of Moses: “Do not muzzle an ox while it is treading out the grain.” Is it about oxen that God is concerned?