Quran 43:37 from Surah Az-Zukhruf on Divine Marvels.
وَإِنَّهُمۡ لَيَصُدُّونَهُمۡ عَنِ ٱلسَّبِيلِ وَيَحۡسَبُونَ أَنَّهُم مُّهۡتَدُونَ
English translation: And indeed they surely turn them away from the Path and they think that they (are) guided
Transliteration: wa-innahum layasuddunahum ani al-sabili wayahsabuna annahum muh'taduna