Dr. Mustafa Khattab, the Clear Quran - Surah Al-Kahf, ayah 25

Translation of Surah Al-Kahf, ayah 25 (18:25)

وَلَبِثُواْ فِي كَهۡفِهِمۡ ثَلَٰثَ مِاْئَةٖ سِنِينَ وَٱزۡدَادُواْ تِسۡعٗا ٢٥
They had remained in their cave for three hundred years, adding nine.1

Foot notes

222090

Three hundred years in the Gregorian calendar equal three hundred and nine years in the Islamic lunar calendar.