"You shall not muzzle an ox while it treads out the grain.
Deuteronomy 25:4
Surrounding context
25:3 Forty blows he may give him and no more, lest he should exceed this and beat him with many blows above these, and your brother be humiliated in your sight.
25:4 "You shall not muzzle an ox while it treads out the grain.
25:5 "If brothers dwell together, and one of them dies and has no son, the widow of the dead man shall not be married to a stranger outside the family; her husband's brother shall go in to her, take her as his wife, and perform the duty of a husband's brother to her.