Ruth 2:20

2:20 Naomi said to her daughter-in-law, “May he be rewarded by the Lord because he has shown loyalty to the living on behalf of the dead!” Then Naomi said to her, “This man is a close relative of ours; he is our guardian.”

Ruth 4:5

4:5 Then Boaz said, “When you acquire the field from Naomi, you must also acquire Ruth the Moabite, the wife of our deceased relative, in order to preserve his family name by raising up a descendant who will inherit his property.”

Deuteronomy 25:5-9

Respect for the Sanctity of Others

25:5 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. 25:6 Then the first son she bears will continue the name of the dead brother, thus preventing his name from being blotted out of Israel. 25:7 But if the man does not want to marry his brother’s widow, then she must go to the elders at the town gate and say, “My husband’s brother refuses to preserve his brother’s name in Israel; he is unwilling to perform the duty of a brother-in-law to me!” 25:8 Then the elders of his city must summon him and speak to him. If he persists, saying, “I don’t want to marry her,” 25:9 then his sister-in-law must approach him in view of the elders, remove his sandal from his foot, and spit in his face. She will then respond, “Thus may it be done to any man who does not maintain his brother’s family line!”

Matthew 22:24-27

22:24 “Teacher, Moses said, ‘If a man dies without having children, his brother must marry the widow and father children for his brother.’ 22:25 Now there were seven brothers among us. The first one married and died, and since he had no children he left his wife to his brother. 22:26 The second did the same, and the third, down to the seventh. 22:27 Last of all, the woman died.