SEV Biblia, Chapter 4:5
Entonces replicó Booz: El mismo día que tomares las tierras de mano de Noemí, tomarás también a Rut la moabita, mujer del difunto, para que levantes el nombre del muerto sobre su posesión.
Clarke's Bible Commentary - Ruth 4:5
Verse 5. 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.
John Gill's Bible Commentary
Ver. 5. Then said Boaz , etc.] 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).
Matthew Henry Commentary
Verses 1-8 - This matter depended on the laws given by Moses about inheritances, an doubtless the whole was settled in the regular and legal manner. Thi kinsman, when he heard the conditions of the bargain, refused it. I like manner many are shy of the great redemption; they are not willin 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 willin 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 an open dealing in all matters of contract and trade, is what all mus make conscience of, who would approve themselves true Israelites without guile. Honesty will be found the best policy.
Original Hebrew
ויאמר 559 בעז 1162 ביום 3117 קנותך 7069 השׂדה 7704 מיד 3027 נעמי 5281 ומאת 854 רות 7327 המואביה 4125 אשׁת 802 המת 4191 קניתי 7069 להקים 6965 שׁם 8034 המת 4191 על 5921 נחלתו׃ 5159