Quran 18:25 from Surah Al-Kahf on Divine Marvels.
وَلَبِثُواْ فِي كَهۡفِهِمۡ ثَلَٰثَ مِاْئَةٖ سِنِينَ وَٱزۡدَادُواْ تِسۡعٗا
English translation: And they remained in their cave (for) three hundred years and add nine
Transliteration: walabithu fi kahfihim thalatha mi-atin sinina wa-iz'dadu tis'an