Quran 18:7 — The Cave (Al-Kahf)

We have adorned everything on earth, in order to test them, and thus distinguish those among them who work righteousness.

[18:6] You may blame yourself on account of their response to this narration, and their disbelieving in it; you may be saddened.

[18:8] Inevitably, we will wipe out everything on it, leaving it completely barren.*