And nothing has prevented Us from sending signs [i.e., miracles] except that the former peoples denied them. And We gave Thamūd the she-camel as a visible sign, but they wronged her. And We send not the signs except as a warning.
And I did not stop sending tangible miracles which the idolaters requested, such as reviving the dead, except because I had sent them to previous nations but they rejected them. I had given Thamud a great, clear sign, namely the camel, but they rejected and so I hastened their punishment. And I do not send miracles at the hands of the Messengers except as a warning for their people, so that they believe.