Quran 37:15 from Surah As-Saaffaat on Divine Marvels.
وَقَالُوٓاْ إِنۡ هَٰذَآ إِلَّا سِحۡرٞ مُّبِينٌ
English translation: And they say Not (is) this except a magic clear
Transliteration: waqalu in hadha illa sih'run mubinun