Ambrose of Milan
Patristic
A.D. 339–397
“Therefore, if we acknowledge that Thamar is described in the genealogies on account of a mystery in the Lord's generations, we must also certainly not consider Ruth to be overlooked for the same reason: about whom the holy Apostle seems to have had an understanding, when he foresaw through the Spirit that the calling of the Gentiles was to be celebrated by the Gospel, saying that the Law is not made for the just, but for the unjust (1 Timothy 1:9). For how did Ruth, being a foreigner, marry a Jew? And by what reasoning did the evangelist think that the mention of a union should be made in the birth of Christ, which was forbidden by the series of laws? Therefore, did the Savior not originate from a legitimate generation (Deut. XXIII, 3)? It seems to be contrary unless we adhere to the apostolic belief, for the law was not established for the righteous, but for the unrighteous. And since she is a foreigner and a Moabite (especially since the law of Moses prohibited these marriages, and the Moabites were excluded from the Church; for it is written: Moabites shall not enter the Church of the Lord even to the third and fourth generation, and forever), how then did she enter into the Church if not because she was holy and blameless in her conduct, above the law? For if the Law was given to the impious and sinners, certainly Ruth, who surpassed the definition of the Law, and entered into the Church, and became an Israelite, and deserved to be counted among the greater ones of the Lord's family, because of the choice of her mind and not her body, is a great example for us, because in her the figure of our entrance into the Church of the Lord, who are gathered from the nations, preceded. Let us therefore imitate her; so that because she deserved this prerogative of being admitted into her society by her manners, as history teaches: we also, because of the choice of our manners, may be counted among the Church of the Lord, with the support of our merits. For when the Israelites were afflicted by famine in the earlier days of the Judges, a man named Elimelech from the city of Bethlehem in Judah, where Christ was born, went to live in the land of Moab with his wife and two sons. His sons took Moabite wives, one named Orpah and the other named Ruth, and they lived there for about ten years before they died. But after her husband and sons died, the woman, left alone and without her own family, heard that God had visited Israel and she decided to return home. She urged her daughters-in-law to go back to their families as well. One concession: but Ruth stayed with her mother-in-law. When her mother-in-law said to her, 'Look, your sister-in-law has gone back to her people and her gods; go back with her,' Ruth replied, 'Do not press me to leave you and to turn back from following you. Where you go, I will go; where you lodge, I will lodge. Your people shall be my people, and your God my God. Where you die, I will die—there will I be buried.' (Ruth 1:15, 17). And so the two arrived at Bethlehem. Therefore, when Boaz, the great-grandfather of David, learned of these customs, as well as the respect towards the mother-in-law, the devotion towards the deceased, and the religiousness towards God, according to the law of Moses, in order to raise up the offspring of the deceased, he chose her as his wife.”