Surah As-Saffat, ayah 15

وَقَالُوٓاْ إِنۡ هَٰذَآ إِلَّا سِحۡرٞ مُّبِينٌ ١٥

Waqālū in hādhā illā sihrum mubīn

And say, "This is not but obvious magic.