Quran 71:2 from Surah Nooh on Divine Marvels.
قَالَ يَٰقَوۡمِ إِنِّي لَكُمۡ نَذِيرٞ مُّبِينٌ
English translation: He said O my people! Indeed I am to you a warner clear
Transliteration: qala yaqawmi inni lakum nadhirun mubinun