I Corinthians 9:6-9

Or is it only Barnabas and I who have no right to refrain from working? Who ever goes to war at his own expense? Who plants a vineyard and does not eat of its fruit? Or who tends a flock and does not drink of the milk of the flock? Do I say these things as a mere man? Or does not the law say the same also? For it is written in the law of Moses, “You shall not muzzle an ox while it treads out the grain.” Is it oxen God is concerned about?