1 Corinthians 9:7-10

7What soldier ever serveth at his own charges? who planteth a vineyard, and eateth not the fruit thereof? or who feedeth a flock, and eateth not of the milk of the flock?

8Do I speak these things after the manner of men? or saith not the law also the same?

9For 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,

10or 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.