Surah Al-Furqan Verse 41

وَإِذَا رَأَوْكَ إِنْ يَتَّخِذُونَكَ إِلَّا هُزُوًا أَهَٰذَا الَّذِي بَعَثَ اللَّهُ رَسُولًا

And when they see you, [O Muhammad], they take you not except in ridicule, [saying], "Is this the one whom Allah has sent as a messenger