Surah At-Takwir 81:22

وَمَا صَاحِبُكُم بِمَجْنُونٍ

And your companion [i.e., Prophet Muḥammad (ﷺ) ] is not [at all] mad.

Translation: Saheeh International

Tafsir

And your companion Muhammad (s) wa-mā sāhibukum 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.

Excerpt from Tafsir al-Jalalayn, commentary on 81:22, via Quran.com. The reader has the full commentary and 9 more tafsirs.