 so that the followers of the bible will know that they can receive no reward from god. they should know that all favors are in the hands of god. he grants them to whomever he wants. the favors of god are great.
لئلا يعلم أهل الكتاب ألا يقدرون على شيء من فضل الله وأن الفضل بيد الله يؤتيه من يشاء والله ذو الفضل العظيم