John Gill Commentary 1 Chronicles 4:40

"And they found fat pasture and good, and the land was wide, and quiet, and peaceable; for they that dwelt there aforetime were of Ham." — 1 Chronicles 4:40 (ASV)

And they found fat pasture and good: In or near the valley of Gedor.

and the land was wide, and quiet, and peaceable; there was room enough for them and their flocks, and they had no enemies on either side to disturb them.

for [they] of Ham had dwelt there of old; either the Canaanites who descended from Canaan the son of Ham, and had never been expelled from thence; or the Philistines, who were a colony of the Egyptians, the posterity of Ham; and these inhabitants being of this cursed race, the Simeonites scrupled not to dispossess them.