Quran 7:184 — Surah Al-A'raf, ayah 184

أَوَلَمۡ يَتَفَكَّرُواْۗ مَا بِصَاحِبِهِم مِّن جِنَّةٍۚ إِنۡ هُوَ إِلَّا نَذِيرٞ مُّبِينٌ

Then do they not give thought? There is in their companion [Muhammad] no madness. He is not but a clear warner

Pa zašto oni ne razmisle da njima poslani poslanik nije lud; on samo otvoreno opominje.