Matthew 1:5

(ubi sup.) But how did Ruth who was an alien marry a man that was a Jew? and wherefore in Christ's genealogy did His Evangelist so much as mention a union, which in the eye of the law was bastard? Thus the Saviour's birth of a parentage not admitted by the law appears to us monstrous, until we attend to that declaration of the Apostle, The Law was not given for the righteous, but for the unrighteous. (1 Tim. 1:9.) For this woman who was an alien, a Moabitess, a nation with whom the Mosaic Law forbad all intermarriage, and shut them totally out of the Church, how did she enter into the Church, unless that she were holy and unstained in her life above the Law? Therefore she was exempt from this restriction of the Law, and deserved to be numbered in the Lord's lineage, chosen from the kindred of her mind, not of her body. To us she is a great example, for that in her was prefigured the entrance into the Lord's Church of all of us who are gathered out of the Gentiles.

Seest thou that it was not for few nor small causes that he brought to our remembrance the whole history concerning Judah? For this end he hath mentioned Ruth also and Rahab, the one an alien, the other an harlot, that thou mayest learn that He came to do away with all our ills. For He hath come as a Physician, not as a Judge. Therefore in like manner as those of old took harlots for wives, even so God too espoused unto Himself the nature which had played the harlot: and this also prophets from the beginning declare to have taken place with respect to the Synagogue. But that spouse was ungrateful towards Him who had been an husband to her, whereas, the Church, when once delivered from the evils received from our fathers, continued to embrace the Bridegroom. See, for instance, what befell Ruth, how like it is to the things which belong to us. For she was both of a strange race, and reduced to the utmost poverty, yet Boaz when he saw her neither despised her poverty nor abhorred her mean birth, as Christ having received the Church, being both an alien and in much poverty, took her to be partaker of the great blessings. But even as Ruth, if she had not before left her father, and renounced household and race, country and kindred, would not have attained unto this alliance; so the Church too, having forsaken the customs which men had received from their fathers, then, and not before, became lovely to the Bridegroom. Of this therefore the prophet discourses unto her, and saith, "Forget thy people, and thy father's house, so shall the king have pleasure in thy beauty." This Ruth did too, and because of this she became a mother of kings, even as the Church did likewise. For of her David himself sprung. So then to shame them by all these things, and to prevail on them not to be high-minded, he hath both composed the genealogy, and brought forward these women. Yes, for this last, through those who intervened, was parent to the great king, and of these David is not ashamed. For it cannot, nay, it cannot be that a man should be good or bad, obscure or glorious, either by the virtue or by the vice of his forefathers; but if one must say somewhat even paradoxical, he shines forth the more, who not being of worthy ancestors, has yet become excellent.

Ruth the Moabitess fulfils the prophecy of Isaiah, Send forth, O Lord, the Lamb that shall rule over the earth, out of the rock of the desert to the mount of the daughter of Sion. (Is. 16:1.)

How Booz took to wife a Moabitess whose name was Ruth, I thought it needless to tell, seeing the Scripture concerning them is open to all. We need but say thus much, that Ruth married Booz for the reward of her faith, for that she had cast off the gods of her forefathers, and had chosen the living God. And Booz received her to wife for reward of his faith, that from such sanctified wedlock might be descended a kingly race. This brave one is the son of Rahab, that is, of the Church; for Rahab signifies 'breadth' or 'spread out,' for because the Church of the Gentiles was called from all quarters of the earth, it is called 'breadth.' They who look to wealth and not temper, to beauty and not faith, and require in a wife such endowments as are required in harlots, will not beget sons obedient to their parents or to God, but rebellious to both; that their children may be punishment of their ungodly wedlock. Obeth begat Jesse, that is 'refreshment,' for whoever is subject to God and his parents, begets such children as prove his 'refreshment.'

But as we believe that the names of these Fathers were given for some special reason under the providence of God, it follows, but Naasson begat Salmon. This Salmon after his father's death entered the promised land with Joshua as prince of the tribe of Judah. He took a wife of the name of Rahab. This Rahab is said to have been that Rahab the harlot of Jericho who entertained the spies of the children of Israel, and hid them safely. For Salmon being noble among the children of Israel, inasmuch as he was of the tribe of Judah, and son of the prince thereof, beheld Rahab so ennobled through her great faith, that she was worthy whom he should take to wife. Salmon is interpreted 'receive a vesselk,' perhaps as if invited in God's providence by his very name to receive Rahab a vessel of election.