Surah Al-Hijr 15:6

وَقَالُوا۟ يَـٰٓأَيُّهَا ٱلَّذِى نُزِّلَ عَلَيْهِ ٱلذِّكْرُ إِنَّكَ لَمَجْنُونٌ

And they say, "O you upon whom the message has been sent down, indeed you are mad.

Translation: Saheeh International

Tafsir

And they that is the disbelievers of Mecca say to the Prophet s ‘O you to whom the Remembrance the Qur’ān — as you claim — has been revealed lo! you are indeed possessed!

Excerpt from Tafsir al-Jalalayn, commentary on 15:6, via Quran.com. The reader has the full commentary and 9 more tafsirs.