Genesis 38:11
Then Judah said to his daughter-in-law Tamar, "Live as a widow in your father's house until my son Shelah grows up." For he thought, "He may die too, like his brothers." So Tamar went to live in her father's house.

Deuteronomy 25:5
When brothers dwell together and one of them dies without a son, the widow must not marry outside the family. Her husband's brother is to take her as his wife and fulfill the duty of a brother-in-law for her.

Ruth 1:10
and said, "Surely we will return with you to your people."

Ruth 1:12
Return home, my daughters. Go on, for I am too old to have another husband. Even if I thought there was hope for me to have a husband tonight and to bear sons,