Deuteronomy 25:4

4 Thou shalt not muzzle the ox when he treadeth out [the grain].

Deuteronomy 25:4 In-Context

2 and it shall be, if the wicked man be worthy to be beaten, that the judge shall cause him to lie down, and to be beaten before his face, according to his wickedness, by number.
3 Forty stripes he may give him, he shall not exceed; lest, if he should exceed, and beat him above these with many stripes, then thy brother should seem vile unto thee.
4 Thou shalt not muzzle the ox when he treadeth out [the grain].
5 If brethren dwell together, and one of them die, and have no son, the wife of the dead shall not be married without unto a stranger: her husband's brother shall go in unto her, and take her to him to wife, and perform the duty of a husband's brother unto her.
6 And it shall be, that the first-born that she beareth shall succeed in the name of his brother that is dead, that his name be not blotted out of Israel.
The American Standard Version is in the public domain.