Amatul Rahmân Omer:
And if entry (of the enemy-forces) were effected (in the town of Madînah) against them from its diverse quarters and then they were incited to (treachery and) join in the disturbance (against the Companions) they would have readily gone for it. But (afterwards as it happened) they could not stay there (in their so called undefended houses) but a little while.