that is because their messengers used to come to them with clear evidences but they said shall human beings guide us? and disbelieved and turned away. and allah dispensed and allah is free of need and praiseworthy.
ذلك بأنه كانت تأتيهم رسلهم بالبينات فقالوا أبشر يهدوننا فكفروا وتولوا واستغنى الله والله غني حميد