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 ground they got elsewhere. When those of this tribe that revolted from the house of David were carried captive with the rest into Assyria those that adhered to Judah were remarkably owned of God and prospered in their endeavours to enlarge their coasts. It was in the days of Hezekiah that a generation of Simeonites, whose tribe had long crouched and truckled, was animated to make these bold efforts. (1.) Some of them attacked a place in Arabia, as it should seem, called the entrance of Gedor, inhabited by the posterity of accursed Ham (Ch1 4:40), made themselves masters of it, and dwelt there. This adds to the glory of Hezekiah's pious reign, that, as his kingdom in general prospered, so did particular families. It is said that they found fat pastures, and yet the land was quiet; even when the kings of Assyria were giving disturbance to all their neighbours this land escaped their alarms. The inhabitants being shepherds, who molested none, were not themselves molested, till the Simeonites came and drove them out and succeeded them, not only in the plenty, but in the peace, of their land. Those who dwell (as we do) in a fruitful country, and whose land is wide, and quiet, and peaceable, have reason to own themselves indebted to that God who appoints the bounds of our habitation. (2.) Others of them, to the number of 500, under the command of four brethren here named, made a descent upon Mount Seir, and smote the remainder of the devoted Amalekites, and took possession of their country, Ch1 4:42, Ch1 4:43. Now the curses on Ham and Amalek had a further accomplishment, when they seemed dormant, if not dead; as had also the curse on Simeon, that he should be divided and scattered (Gen 49:7): yet to him it was turned into a blessing, for the families of Simeon, which thus transplanted themselves into those distant countries, are said to dwell there unto this day (Ch1 4:43), by which it should seem they escaped the calamities of the captivity. Providence sometimes sends those out of trouble that are designed for preservation.

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.

And they smote the rest of the Amalekites that were escaped,.... That escaped the sword of Saul; though, according to the Jews (n), 100,000 of them were slain by him in one day; and of the sword of David, though he is said not to leave man or woman alive, Sa1 27:8.

and dwelt there unto this day; in the cities of the Amalekites, even of the posterity of the above; who were some of the remnant of Israel, that were not carried away by the king of Assyria, and who dwelt here after the return of the Jews from the Babylonish captivity, even in the times of Ezra, the writer of this book; see Ch2 34:9.

(n) Midrash Esther, fol. 93. 4.

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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