(They) i.e. Banu Qurayzah and Banu'l-Nadir (will not fight against you in a body save in fortified villages or from behind walls) or if there is between you and them walls. (Their adversity among themselves is very great) He says: their fighting against each other is great, for they fought against their own folk and not against the Prophet (pbuh) and his Companions. (Ye think of them as a whole) united (whereas their hearts are diverse) whereas they differ a great deal. (That) differing and betrayal (is because they are a folk who have no sense) is because they do not understand Allah's command and divine Oneness.