TSK
Treasury of Scripture Knowledge references in WEB.
If brothers dwell together, and one of them die, and have 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 to him as wife, and perform the duty of a husband's brother to her.
Naomi said to her daughter-in-law, "Blessed be he of Yahweh, who has not left off his kindness to the living and to the dead." Naomi said to her, "The man is a close relative to us, one of our near kinsmen."
The near kinsman said, "I can't redeem it for myself, lest I mar my own inheritance. Take my right of redemption for yourself; for I can't redeem it."
saying, "Teacher, Moses said, 'If a man dies, having no children, his brother shall marry his wife, and raise up seed for his brother.'
For men indeed swear by a greater one, and in every dispute of theirs the oath is final for confirmation.