Quran 15:14 from Surah Al-Hijr on Divine Marvels.
وَلَوۡ فَتَحۡنَا عَلَيۡهِم بَابٗا مِّنَ ٱلسَّمَآءِ فَظَلُّواْ فِيهِ يَعۡرُجُونَ
English translation: And (even) if We opened to them a gate from the heaven and they were to continue therein (to) ascend
Transliteration: walaw fatahna alayhim baban mina al-samai fazallu fihi ya'rujuna