17:59 Nothing prevented Us from sending the signs but that the ancients belied them. To Thamood, We brought the she-camel as a visible (sign), yet they wronged her. We do not send signs except to frighten.
17:60 When We said to you (Prophet Muhammad), 'Indeed, your Lord encompasses all people.' We did not make the vision which We showed to you, and the tree cursed in the Koran except to be a trial for people, and We frighten them, but it only increases them in great insolence.