Hidden within ancient genealogical records are obscure historical events and forgotten figures. Among the descendants of Shelah, the son of Judah [רש״י, רד״ק], certain names represent specific individuals or the heads of prominent families, such as Jokim and Jashubi-lehem [מצודת דוד, רד״ק, מלבי״ם]. In contrast, the men of Cozeba likely refers to the residents of a particular place, possibly the biblical city of Achzib [רד״ק].
The accounts of two other figures, Joash and Saraph, and their involvement with Moab, present two distinct historical narratives. According to Midrashic tradition, Joash and Saraph are actually Mahlon and Chilion, familiar figures from the Book of Ruth who were known by two names. In this view, their connection to Moab refers to their marriages to Moabite women, with the name Jashubi-lehem hinting at their roots in Bethlehem [רש״י, רד״ק, ביאור שטיינזלץ]. Some suggest this connection to Moab might even trace back to an earlier tragedy, referencing the sin with the Moabite women at Shittim during the time of Moses [רלב״ג]. On the other hand, the plain understanding of the history paints Joash and Saraph as military heroes from Shelah's family. In this context, they fought against Moab, conquered the territory, and ruled over its people as masters [מצודת דוד, רד״ק, מלבי״ם].
The obscurity of these events raises a natural question as to why such victories and stories do not appear in other prophetic books. The primary approach among commentators is that these events occurred in the earliest generations. Because so much time had passed, the details faded from public memory, yet they survived as a reliable oral tradition passed down through the ages [רש״י, מצודת דוד, רלב״ג, רד״ק, מלבי״ם]. Another perspective suggests that these specific genealogical details were carefully copied from unique, ancient manuscripts preserved by Ezra the Scribe [מלבי״ם, ביאור שטיינזלץ]. Furthermore, this acknowledgment of the ancient nature of the records may not be limited to these specific families alone, but rather serves as a general note validating all the genealogical lists recorded up to this point in the text [רד״ק].