Quran 37:117 from Surah As-Saaffaat on Divine Marvels.
وَءَاتَيۡنَٰهُمَا ٱلۡكِتَٰبَ ٱلۡمُسۡتَبِينَ
English translation: And We gave both of them the Book the clear
Transliteration: waataynahuma al-kitaba al-mus'tabina