TSK · Ruth 3:2

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.

So Boaz said to Ruth,“Listen carefully, my dear! Do not leave to gather grain in another field. You need not go beyond the limits of this field. You may go along beside my female workers.

For indeed he who makes holy and those being made holy all have the same origin, and so he is not ashamed to call them brothers and sisters,