Observe the action of the Levirate law. If there had been no one interested but Naomi, she would have sold the land unclogged by any condition, the law of Levirate having no existence in her case. But there was a young widow upon whom the possession of the land would devolve at Naomi's death, and who already had a right of partnership in it, and the law of Levirate did apply in her case. It was, therefore, the duty of the גאל gā'al to marry her and raise up seed to his brother, i. e. his kinsman. And he could not exercise his right of redeeming the land, unless he was willing at the same time to fulfill his obligations to the deceased by marrying the widow. This he was unwilling to do.

Thou must buy it also of Ruth - More properly, Thou wilt also acquire Ruth. Thou canst not get the land without taking the wife of the deceased and then the children which thou mayest have shall be reputed the children of Mahlon, thy deceased kinsman.

Then said Boaz,.... In order to try the kinsman, whether he would abide by his resolution, he acquaints him with what he had as yet concealed:

what day thou buyest the field of Naomi, thou must buy it also of Ruth the Moabitess, the wife of the dead; the wife of Mahlon, who was dead, the eldest son of Naomi, and so his widow, Ruth the Moabitess, had the reversion of the estate; wherefore the purchase must be made of her as well as of Naomi, and the purchase could not be made of her without marrying her; which, though no law obliged to, yet it seems to be a condition of the purchase annexed to it by Naomi, that she would sell it to no man, unless he would consent to marry Ruth, for whose settlement she had a great concern, having been very dutiful and affectionate to her; which is clearly intimated in the next clause:

to raise up the name of the dead upon his inheritance; and so Naomi had another end to answer thereby, not only to provide a good husband for her daughter-in-law, but to perpetuate the name of her son, agreeably to the design of the law in Deuteronomy 25:5.

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 {d} inheritance.

(d) That his inheritance might bear his name that is dead.

4:5 Buy it - According to the law, Deut 25:5. To raise, and c - To revive his name, which was buried with his body, by raising up a seed to him, to be called by his name.

4:1-8 This matter depended on the laws given by Moses about inheritances, and doubtless the whole was settled in the regular and legal manner. This kinsman, when he heard the conditions of the bargain, refused it. In like manner many are shy of the great redemption; they are not willing to espouse religion; they have heard well of it, and have nothing to say against it; they will give it their good word, but they are willing to part with it, and cannot be bound to it, for fear of marring their own inheritance in this world. The right was resigned to Boaz. Fair and open dealing in all matters of contract and trade, is what all must make conscience of, who would approve themselves true Israelites, without guile. Honesty will be found the best policy.