So Boaz took Ruth, and she became his wife. And he went in to her, and the LORD gave her conception, and she bore a son. Then the women said to Naomi, “Blessed be the LORD, who has not left you this day without a redeemer, and may his name be renowned in Israel! He shall be to you a restorer of life and a nourisher of your old age, for your daughter-in-law who loves you, who is more to you than seven sons, has given birth to him.” Then Naomi took the child and laid him on her lap and became his nurse. And the women of the neighborhood gave him a name, saying, “A son has been born to Naomi.” They named him Obed. He was the father of Jesse, the father of David. Now these are the generations of Perez: Perez fathered Hezron, Hezron fathered Ram, Ram fathered Amminadab, Amminadab fathered Nahshon, Nahshon fathered Salmon, Salmon fathered Boaz, Boaz fathered Obed, Obed fathered Jesse, and Jesse fathered David. (Ruth 4:13-22)
Ruth bore a son, through whonds 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.
Adapted from Matthew Henry Concise Commentary