John Gill Commentary 2 Samuel 4:3

"and the Beerothites fled to Gittaim, and have been sojourners there until this day)." — 2 Samuel 4:3 (ASV)

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 (1 Samuel 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 (Nehemiah 11:33).