Buy it — According to the law, Deuteronomy 25:5. To raise, &c — To revive his name, which was buried with his body, by raising up a seed to him, to be called by his name.
Related Commentaries of Ruth 4:5
Ruth 4:5
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.