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"These are the generations of Perez," i.e., the families descended from Perez in their genealogical order (toledoth: see at Gen 2:4). The genealogy only goes back as far as Perez, because he was the founder of the family of Judah which was named after him (Num 26:20), and to which Elimelech and Boaz belonged. Perez, a son of Judah by Tamar (Gen 38:29), begat Hezrom, who is mentioned in Gen 46:12 among the sons of Judah who emigrated with Jacob into Egypt, although (as we have shown in our comm. on the passage) he was really born in Egypt. Of this son Ram (called Aram in the Sept. Cod. Al., and from that in Mat 1:3) nothing further is known, as he is only mentioned again in Ch1 2:9. His son Amminidab was the father-in-law of Aaron, who had married his daughter (Exo 6:23), and the father of Nahesson (Nahshon), the tribe-prince of the house of Judah in the time of Moses (Num 1:7; Num 2:3; Num 7:12). According to this there are only four or five generations to the 430 years spent by the Israelites in Egypt, if we include both Perez and Nahesson; evidently not enough for so long a time, so that some of the intermediate links must have been left out even here. But the omission of unimportant members becomes still more apparent in the statement which follows, viz., that Nahshon begat Salmah, and Salmah Boaz, in which only two generations are given for a space of more than 250 years, which intervened between the death of Moses and the time of Gideon. Salmah (שׂלמה or שׂלמא, Ch1 2:11) is called Salmon in Rut 4:21; a double form of the name, which is to be explained form the fact that Salmah grew out of Salmon through the elision of the n, and that the terminations an and on are used promiscuously, as we may see from the form שׁריה in Job 41:18 when compared with שׁרין in Kg1 22:…

In this chapter we have the wedding between Boaz and Ruth, in the circumstances of which there was something uncommon, which is kept upon record for the illustration, not only of the law concerning the marrying of a brother's widow (Deu 25:5, etc.), for cases help to expound laws, but of the gospel too, for from this marriage descended David, and the Son of David, whose espousals to the Gentile church were hereby typified. We are here told, I. How Boaz got clear of his rival, and fairly shook him off (Rut 4:1-8). II. How his marriage with Ruth was publicly solemnized, and attended with the good wishes of his neighbours (Rut 4:9-12). III. The happy issue that descended from this marriage, Obed, the grandfather of David (Rut 4:13-17). And so the book concludes with the pedigree of David (Rut 4:18-22). Perhaps it was to oblige him that the blessed Spirit directed the inserting of this story in the sacred canon, he being desirous that the virtues of his great-grandmother Ruth, together with her Gentile extraction and the singular providences that attended her, should be transmitted to posterity.

4:18-22 The book of Ruth ends with a genealogy of ten generations, from Perez, the son of Judah (Jacob’s son), to David, the grandson of Obed. Besides being one of the world’s great stories, this tale concerns the family history of David, Israel’s greatest king. That Ruth and Boaz were ancestors of Israel’s greatest king is a major reason for the inclusion of this small book in the Old Testament.