Quran 18:12 — Surah Al-Kahf, ayah 12

ثُمَّ بَعَثۡنَٰهُمۡ لِنَعۡلَمَ أَيُّ ٱلۡحِزۡبَيۡنِ أَحۡصَىٰ لِمَا لَبِثُوٓاْ أَمَدٗا

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

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