Al-Isra 17:59

Wama manaAAana an nursila bil-ayatiilla an kaththaba biha al-awwaloona waataynathamooda annaqata mubsiratan fathalamoobiha wama nursilu bil-ayatiilla takhweefa

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.

Nothing made us refrain from sending the signs (demanded by the pagans,) except that the earlier people had rejected them. (For example,) We gave Thamūd the she-camel, as an eye-opener, then they did wrong to her, and We do not send signs but as a warning.