'Treading' in the Bible

For it is written in the Law of Moses, “You shall not muzzle an ox while it is treading out the grain [to keep it from eating the grain].” Is it [only] for oxen that God cares?

For the Scripture says, “You shall not muzzle the ox while it is treading out the grain [to keep it from eating],” and, “The worker is worthy of his wages [he deserves fair compensation].”