Quran 18:7 — The Cave (Al-Kahf)

إِنّا جَعَلنا ما عَلَى الأَرضِ زينَةً لَها لِنَبلُوَهُم أَيُّهُم أَحسَنُ عَمَلًا

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.*