say have you thought what if this quran really is from god and you reject it? what if one of the children of israel testifies to its similarity to earlier scripture and believes in it and yet you are too arrogant to do the same? god certainly does not guide evildoers.
قل أرأيتم إن كان من عند الله وكفرتم به وشهد شاهد من بني إسرائيل على مثله فآمن واستكبرتم إن الله لا يهدي القوم الظالمين