Deuteronomy 25:4-6

Modern English Version

⁴ You must not muzzle the ox when he treads out the grain.

Levirate Marriage

⁵ If brothers dwell together, and one of them dies without having had a child, the wife of the deceased may not marry outside the family to a stranger. Her husband’s brother must go to her and take her to himself as a wife and perform the duty of a husband’s brother to her. ⁶ It shall be, that the firstborn whom she bears shall continue in the name of his brother who is deceased, so that his name will not be blotted out of Israel.