The meaning of Muzzle in the Bible
(From International Standard Bible Encyclopedia)

muz'l (chacam; phimoo) : According to the Deuteronomic injunction (Deuteronomy 25:4), the ox was not to be muzzled while treading the grain, i.e. threshing. The muzzle was a guard placed on the mouth of the oxen to prevent them from biting or eating. The threshing ox would have ample opportunity of feeding (compare Hosea 10:11). The Deuteronomic injunction is quite in accordance with the humane spirit which inspires it all through. Paul quotes this law in two places (I Corinthians 9:9; I Timothy 5:18) to illustrate his view that the "laborer is worthy of his hire."

T. Lewis

See more on the meaning of Muzzle in the Bible:
Muzzle {Easton's Bible Dictionary}

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