Deuteronomy 25:4-6

World English Bible

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

⁵ If brothers dwell together, and one of them dies and has no son, the wife of the dead shall not be married outside to a stranger. Her husband’s brother shall go in to her, and take her as his wife, and perform the duty of a husband’s brother to her. ⁶ It shall be that the firstborn whom she bears shall succeed in the name of his brother who is dead, that his name not be blotted out of Israel.