that is because when their messengers came to them with clear proofs they said shall humans be our guides they disbelieved and turned away but allah was not in need . allah is the rich and the praised.
ذلك بأنه كانت تأتيهم رسلهم بالبينات فقالوا أبشر يهدوننا فكفروا وتولوا واستغنى الله والله غني حميد