Surah Al-Kahf — Ayah 12 (18:12)
ثُمَّ بَعَثۡنَٰهُمۡ لِنَعۡلَمَ أَيُّ ٱلۡحِزۡبَيۡنِ أَحۡصَىٰ لِمَا لَبِثُوٓاْ أَمَدٗا ١٢
English translation (Saheeh International)
Then We awakened them that We might show which of the two factions was most precise in calculating what [extent] they had remained in time.
Brief commentary
Then after their lengthy sleep I woke them up to demonstrate which of the two groups disputing their duration of stay in the cave knows this duration best.