Quran 7:184 from Surah Al-A'raaf on Divine Marvels.
أَوَلَمۡ يَتَفَكَّرُواْۗ مَا بِصَاحِبِهِم مِّن جِنَّةٍۚ إِنۡ هُوَ إِلَّا نَذِيرٞ مُّبِينٌ
English translation: Do not they reflect Not in their companion [of] (is) any madness Not he (is) but a warner clear
Transliteration: awalam yatafakkaru ma bisahibihim min jinnatin in huwa illa nadhirun mubinun