Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:68:2 –

You are not, ˹O Muhammad˺, by the favor of your Lord, a madman.  

You are not, O Muhammad (s), by the grace of your Lord, a madman, that is to say, madness is precluded in your case, on account of your Lord’s grace to you by way of ˹His assigning to you˺ prophethood and in other ways — this was a refutation of their saying that he was a madman.
القرآن:٦٨:٢ –

مَا أَنْتَ بِنِعْمَةِ رَبِّكَ بِمَجْنُونٍ  

{ما أنت} يا محمد {بنعمة ربك بمجنون} أي انتفى الجنون عنك بسبب إنعام ربك عليك بالنبوة وغيرها وهذا رد لقولهم إنه مجنون.

See similar narrations below:

Collected by Qurʾān
quran:52:29 –

So remind ˹O Muhammad˺, for you are not, by the favor of your Lord, a soothsayer or a madman.  

So remind, persist in reminding the idolaters and do not desist ˹from this˺ even if they say to you that you are a soothsayer or a madman. For by the grace of your Lord, by His bestowal of grace on you, you are neither soothsayer (bi-kāhinin is the predicate of mā) nor madman (wa-lā majnūnin, a supplement to it).
القرآن:٥٢:٢٩ –

فَذَكِّرْ فَمَا أَنْتَ بِنِعْمَتِ رَبِّكَ بِكَاهِنٍ وَلَا مَجْنُونٍ  

{فذكِّر} دم على تذكير المشركين ولا ترجع عنه لقولهم لك كاهن مجنون {فما أنت بنعمة ربك} بإنعامه عليك {بكاهن} خبر ما {ولا مجنون} معطوف عليه.