Mark 12:19
"Teacher, Moses wrote for us: 'If a man's brother dies and leaves a wife but no children, that man must marry the widow and father children for his brother.'
Genesis 38:8
Then Judah said to Onan, "Have sexual relations with your brother's wife and fulfill the duty of a brother-in-law to her so that you may raise up a descendant for your brother."
Deuteronomy 25:5-10
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.
Ruth 1:11-13
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!
Ruth 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."