Ruth 4:5
"Then said Boaz, What day thou buyest the field of the hand of Naomi, thou must buy it also of Ruth the Moabitess, the wife of the dead, to raise up the name of the dead upon his inheritance."
Cross References (ranked by relevance)
Genesis 38:8
And Judah said unto Onan, Go in unto thy brother’s wife, and marry her, and raise up seed to thy brother.
Matthew 22:24
Saying, Master, Moses said, If a man die, having no children, his brother shall marry his wife, and raise up seed unto his brother.
Luke 20:28
Saying, Master, Moses wrote unto us, If any man’s brother die, having a wife, and he die without children, that his brother should take his wife, and raise up seed unto his brother.