Deuteronomy 25:5

Laws Concerning Levirate Marriage

5 aIf brothers dwell together, and one of them dies and has no son, the wife of the dead man shall not be married outside the family to a stranger. Her bhusband’s brother shall go in to her and take her as his wife and perform the duty of a husband’s brother to her.

Ruth 1:11

11But Naomi said, “Turn back, my daughters; why will you go with me? Have I yet sons in my womb cthat they may become your husbands?
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