Quran 37:14 from Surah As-Saaffaat on Divine Marvels.
وَإِذَا رَأَوۡاْ ءَايَةٗ يَسۡتَسۡخِرُونَ
English translation: And when they see a Sign they mock
Transliteration: wa-idha ra-aw ayatan yastaskhiruna