His largest work is called Shelah (abbreviated from the initials of the full title Shene luhoth ha-berit, " Two Tables of the Covenant").
Relates how Tamar, when Shelah was not given to her, obtained a child through her father-in-law Judah (see esp. vers.
It is purely local and is interested in Shelah, and more especially in Perez and Zerah, names of families or clans of the post-exilic age.
And iv., the genealogies represent a Judah composed of clans from the south (Caleb and Jerahmeel) and of small families or guilds, Shelah included.