Luke 20:28
and asked him, "Teacher, Moses wrote for us that if a man's brother dies and leaves a wife but no child, the man should marry the widow and have children for his brother.
Genesis 38:8
So Judah instructed Onan, "You are to have sexual relations with your dead brother's wife, performing the duty of a brother-in-law with her, and have offspring for your brother."
Genesis 38:11
After this, Judah told his daughter-in-law Tamar, "Go live as a widow in your father's house until my son Shelah grows up." But he was really thinking, ""otherwise, Shelah might die like his brothers." So Tamar left and lived in her father's house.
Genesis 38:26
When Judah recognized them, he admitted, "She is more upright than I, because I never did give her my son Shelah." And he never had sex with her again.
Deuteronomy 25:5-10
"When two brothers are living together and one of them dies without leaving a son, his widow must not be married outside the family to a foreigner. Instead, the brother-in-law must go to her, take her as his wife, and by doing so perform the duty of a brother-in-law.
Ruth 1:11-12
But Naomi responded, "Go back, my daughters. Why go with me? Are there still sons to be born to me as future husbands for you?