ٱلتَّكْوِير : ٢٢

  • وَمَا And not
  • صَاحِبُكُم (is) your companion
  • بِمَجۡنُونٖ mad
And your companion [i.e., Prophet Muḥammad (ﷺ) ] is not [at all] mad.1
Footnotes
1 Literally, "possessed by jinn."
And your companion, Muhammad may peace and salutation be upon him (wa-maa saahibukum: a supplement to [the clause from] innahu, 'truly this is', up to the last of the oath clauses) is not a madman, as you claim.