that was because their messengers came to them with clear signs but they replied shall mortals be our guides? and so they rejected the truth and turned away. god has no need of such people god is selfsufficient and worthy of all praise.
ذلك بأنه كانت تأتيهم رسلهم بالبينات فقالوا أبشر يهدوننا فكفروا وتولوا واستغنى الله والله غني حميد