Deuteronomy 25:4

4 Do not muzzle an ox while it is treading out the grain.

Read Deuteronomy 25:4 Using Other Translations

Thou shalt not muzzle the ox when he treadeth out the corn.
"You shall not muzzle an ox when it is treading out the grain.
“You must not muzzle an ox to keep it from eating as it treads out the grain.