Mark 12:19

'Teacher, Moses wrote to us, that if any one's brother may die, and may leave a wife, and may leave no children, that his brother may take his wife, and raise up seed to his brother.

Genesis 38:8

And Judah saith to Onan, 'Go in unto the wife of thy brother, and marry her, and raise up seed to thy brother;'

'When brethren dwell together, and one of them hath died, and hath no son, the wife of the dead is not without to a strange man; her husband's brother doth go in unto her, and hath taken her to him for a wife, and doth perform the duty of her husband's brother;

Ruth 1:11-13

And Naomi saith, 'Turn back, my daughters; why do ye go with me? are there yet to me sons in my bowels that they have been to you for husbands?

Ruth 4:5

And Boaz saith, 'In the day of thy buying the field from the hand of Naomi, then from Ruth the Moabitess, wife of the dead, thou hast bought it, to raise up the name of the dead over his inheritance.'

Treasury of Scripture Knowledge

Summary

Mark 12:19

Master, Moses wrote unto us, If a man's brother die, and leave his wife behind him, and leave no children, that his brother should take his wife, and raise up seed unto his brother.