Quran 15:6

وَقَالُوا يَا أَيُّهَا الَّذِي نُزِّلَ عَلَيْهِ الذِّكْرُ إِنَّكَ لَمَجْنُونٌ

They say: "O thou to whom the Message is being revealed! truly thou art mad (or possessed)!