TSK · Leviticus 18:16

If brothers dwell together, and one of them die, and have no son, the wife of the dead shall not be married outside to a stranger: her husband's brother shall go in to her, and take her to him as wife, and perform the duty of a husband's brother to her.

saying, "Teacher, Moses said, 'If a man dies, having no children, his brother shall marry his wife, and raise up seed for his brother.'

"Teacher, Moses wrote to us, 'If a man's brother dies, and leaves a wife behind him, and leaves no children, that his brother should take his wife, and raise up offspring for his brother.'