Adam Clarke, on 1Chr 4:31

“And in Bethmarchaboth, and in Hasarsusim, and in Bethberai, and in Saarim. These were their cities unto the reign of David.”

“These were their cities unto the reign of David - It appears that David took some of the cities of the Simeonites, and added them to Judah; Ziklag for instance, Sa1 27:6. As the tribe of Simeon had withdrawn their allegiance from the house of David, the kings of Judah extended their domination as far as possible into the territories of that tribe, so that they were obliged to seek pasture for their flocks at Gedor, and in the mountains of Seir, as we find Ch1 4:39-42.”

Imported from an open dataset — not yet checked against the printed edition.