Commentaire sur Chroniques 1 4:21

The sons of Shelah the son of Judah Since he did not yet trace his geneology, he traces it now. Because of David’s honor, he first traced the genealogy of the sons of Tamar: Perez and Zerah, from whom he [David] was descended; now that he has traced the genealogy of the families of Perez and Zerah, he commences to trace the genealogy of all the families that were in that generation.

and the families of Beth Abodath Habbuz lit. the house of the linen work, for the curtains of the Sanctuary. They too were of the sons of Shelah.