Mark 12:19
Teacher, Moses wrote that if a man's brother die, and leave a wife behind him, and leave no child, that his brother should take his wife, and raise up seed for his brother.
Genesis 38:8
Then Judah said to Er's brother Onan: Go sleep with your brother's widow. Fulfill your obligation to her as her husband's brother. That way your brother may have descendants.
Deuteronomy 25:5-10
When brothers live together and one of them dies without a son the wife of the deceased shall not marry outside the family to a strange man. Her husband's brother shall marry her and perform the duty of a husband's brother to her.
Ruth 1:11-13
You must go back, my daughters, Naomi replied. Why do you want to come with me? Do you think I could have sons again for you to marry?
Ruth 4:5
Then Boaz said: On the day when you take this field, you will have to take with it Ruth, the Moabitess, the wife of the dead, so that you may keep the name of the dead living in his heritage.