Adam Clarke, on 1Chr 4:40

“And they found fat pastures, and very good, and a country spacious, and quiet, and fruitful, in which some of the race of Cham had dwelt before.”

“They of Ham had dwelt there of old - These were probably either Philistines or Egyptians, who dwelt at Gedor, which was situated in the environs of Joppa and Samnia. Those whom the five hundred Simeonites expelled from Seir were Amalekites, Ch1 4:43.”

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