Quran 18:9 — The Cave (Al-Kahf)

أَم حَسِبتَ أَنَّ أَصحٰبَ الكَهفِ وَالرَّقيمِ كانوا مِن ءايٰتِنا عَجَبًا

Why else do you think we are telling you about the people of the cave, and the numbers connected with them? They are among our wondrous signs.

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

[18:10] When the youths took refuge in the cave, they said, "Our Lord, shower us with Your mercy, and bless our affairs with Your guidance."