TSK · Genesis 38:8

You must not have sexual relations with your brother’s wife; she is your brother’s nakedness.

Respect for the Sanctity of Others If brothers live together and one of them dies without having a son, the dead man’s wife must not remarry someone outside the family. Instead, her late husband’s brother must go to her, marry her, and perform the duty of a brother-in-law.

But Naomi replied,“Go back home, my daughters! There is no reason for you to return to Judah with me! I am no longer capable of giving birth to sons who might become your husbands!

The guardian said,“Then I am unable to redeem it, for I would ruin my own inheritance in that case. You may exercise my redemption option, for I am unable to redeem it.”