3 because the people of Beeroth fled to Gittaim and have resided there as foreigners to this day.

Read 2 Samuel 4:3 Using Other Translations

And the Beerothites fled to Gittaim, and were sojourners there until this day.)
the Beerothites fled to Gittaim and have been sojourners there to this day).
because the original people of Beeroth fled to Gittaim, where they still live as foreigners.