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