1 Corinthians 9:9-10

9For it is written in the law of Moses, Thou shalt not muzzle the mouth of the ox that treadeth out the grain. Doth God take care for oxen? 10Or saith he this altogether for our sakes? For our sakes, no doubt, this is written: that he that ploweth should plow in hope; and that he that thresheth in hope should be partaker of his hope.