because the Beerothites fled to Gittaim and have lived there as foreigners to this day.
Here is, I. The weakness of Saul's house. Still it grew weaker and weaker. 1. As for Ishbosheth, who was in possession of the throne, his hands were feeble, Sa2 4:1. All the strength they ever had was from Abner's support, and now that he was dead he had no spirit left in him.
Commenting on 2 Samuel 4:1-8
And the Beerothites fled to Gittaim, and were sojourners there until that day. At the death of Saul, when many of the Israelites deserted their cities, and left them to the Philistines, Sa1 31:7; and so the inhabitants of Beeroth forsook their city, which was near the Philistines, and went to Gittaim, a city in the same tribe, though a little further off, see Neh 11:33. .
And the Beerothites fled to Gittaim, and were sojourners there until this day.) (d) After the death of Saul, for fear of the Philistines.