Quran 7:101 — The Purgatory (Al-A'araf)

We narrate to you the history of those communities: their messengers went to them with clear proofs, but they were not to believe in what they had rejected before. GOD thus seals the hearts of the disbelievers.

[7:100] Does it ever occur to those who inherit the earth after previous generations that, if we will, we can punish them for their sins, and seal their hearts, causing them to turn deaf?

[7:102] We found that most of them disregard their covenant; we found most of them wicked.*