Complete Commentary on the Whole Bible, by Matthew Henry, at sacred-texts.com
(Rut 4:1-8) The kinsman refuses to redeem Ruth's inheritance.
(Rut 4:9-12) Boaz marries Ruth.
(Rut 4:13-22) Birth of Obed.
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.
Men are ready to seize opportunities for increasing their estates, but few know the value of godliness. Such are the wise men of this world, whom the Lord charges with folly. They attend not to the concerns of their souls, but reject the salvation of Christ, for fear of marring their inheritance. But God did Boaz the honour to bring him into the line of the Messiah, while the kinsman, who was afraid of lessening himself, and marring his inheritance, has his name, family, and inheritance forgotten.
Ruth bore a son, through whom thousands and myriads were born to God; and in being the lineal ancestor of Christ, she was instrumental in the happiness of all that shall be saved by him; even of us Gentiles, as well as those of Jewish descent. She was a witness for God to the Gentile world, that he had not utterly forsaken them, but that in due time they should become one with his chosen people, and partake of his salvation. Prayer to God attended the marriage, and praise to him attended the birth of the child. What a pity it is that pious language should not be more used among Christians, or that it should be let fall into formality! Here is the descent of David from Ruth. And the period came when Bethlehem-Judah displayed greater wonders than those in the history of Ruth, when the outcast babe of another forlorn female of the same race appeared, controlling the counsels of the Roman master of the world, and drawing princes and wise men from the east, with treasures of gold, and frankincense, and myrrh to his feet. His name shall endure for ever, and all nations shall call Him blessed. In that Seed shall all the nations of the earth be blessed.