Al-Hijr 15:14 ولو فتحنا عليهم بابا من السماء فظلوا فيه يعرجون ١٤

The Stubborn Disbelievers will never believe, no matter what Signs and Wonders They see

Allah explains the extent of their disbelief and stubborn resistance to the truth by stating that even if a door to heaven were to be opened for them, and they were to be taken up through it, they would still not