Mark 12:19
"Teacher, Moses wrote for us that if a man's brother dies and leaves a wife, but leaves no child, the man must take the widow and raise up offspring for his brother.
Genesis 38:8
Then Judah said to Onan, "Go in to your brother's wife and perform the duty of a brother-in-law to her, and raise up offspring for your brother."
Deuteronomy 25:5-10
"If brothers dwell together, and one of them dies and has no son, the wife of the dead man shall not be married outside the family to a stranger. Her husband's brother shall go in to her and take her as his wife and perform the duty of a husband's brother to her.
Ruth 1:11-13
But Naomi said, "Turn back, my daughters; why will you go with me? Have I yet sons in my womb that they may become your husbands?
Ruth 4:5
Then Boaz said, "The day you buy the field from the hand of Naomi, you also acquire Ruth the Moabite, the widow of the dead, in order to perpetuate the name of the dead in his inheritance."