1 Corinthians 9:9-10

For it is written in the law of Moses, Thou shalt not muzzle the ox when he treadeth out the corn. Is it for the oxen that God careth, or saith he it assuredly for our sake? Yea, for our sake it was written: because he that ploweth ought to plow in hope, and he that thresheth, to thresh in hope of partaking.