Matthew Henry on 1 Chronicles 4:24–end
We have here some of the genealogies of the tribe of Simeon (though it was not a tribe of great note), especially the princes of that tribe, Ch1 4:38. Of this tribe it is said that they increased greatly, but not like the children of Judah, Ch1 4:27. Those whom God increases ought to be thankful, though they see others that are more increased. Here observe, 1. The cities allotted them (Ch1 4:28), of which see Jos 19:1, etc. When it is said that they were theirs unto the reign of David (Ch1 4:31) intimation is given that when the ten tribes revolted from the house of David many of the Simeonites quitted these cities, because they lay within Judah, and seated themselves elsewhere. 2. The groun…
Read the whole note in the consoleJamieson-Fausset-Brown on 1 Chronicles 4:38
increased greatly, and they went to the entrance of Gedor--Simeon having only a part of the land of Judah, they were forced to seek accommodation elsewhere; but their establishment in the new and fertile pastures of Gederah was soon broken up; for, being attacked by a band of nomad plunderers, they were driven from place to place till some of them effected by force a settlement on Mount Seir.
Next: 1 Chronicles Chapter 5
Adam Clarke on 1 Chronicles 4:31
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As the tribe of Simeon had withdrawn their allegiance from the house of David, the kings of Judah extended their domination as far as possible into the territories of that tribe, so that they were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.
John Gill on 1 Chronicles 4:39
And they went to the entrance of Gedor,.... There was a city of this name in the tribe of Judah, 1 Chronicles 4:18 but this seems to be further off, and perhaps is the same with Gedaris, mentioned by Strabo (l) along with Azotus and Askelon, cities that belonged to the Philistines; since it was inhabited by the posterity of Ham, of whom the Philistines were, as in the following verse:
even unto the east side of the valley; which was near to Gedor, and a suitable place:
to seek pasture for their flocks; their sheep and goats.
(l) Geograph. l. 16. p. 522.