1 Corinthians 9:7-9

7Who ever carries on war at his own charges? who plants a vineyard and does not eat of its fruit? or who herds a flock and does not eat of the milk of the flock?

8Do I speak these things as a man, or does not the law also say these things?

9For in the law of Moses it is written, Thou shalt not muzzle the ox that is treading out corn. Is 1God occupied about the oxen,