اَوَلَمْ يَتَفَكَّرُوْا مَا بِصَاحِبِهِمْ مِّنْ جِنَّةٍۗ اِنْ هُوَ اِلَّا نَذِيْرٌ مُّبِيْنٌ ( الأعراف: ١٨٤ )
Awalam yatafakkaroo maa bisaahibihim min jinnah; in huwa illaa nazeerum mubeen (al-ʾAʿrāf 7:184)
Then do they not give thought? There is in their companion [i.e., Muhammad (^)] no madness. He is not but a clear warner. (Al-A'raf  : 184)
1 Mufti Taqi Usmani
Have they not reflected that their fellow (i.e. the Holy Prophet) does not suffer from any madness? He is but a plain warner.