68:1-2
نۚ وَالْقَلَمِ وَمَا يَسْطُرُونَ مَا أَنتَ بِنِعْمَةِ رَبِّكَ بِمَجْنُونٍ
“Nun. By the pen and what they inscribe – you are not, by the favour of your Lord, a madman.”
Among the earliest revelations – Allah swears by the pen itself to refute the charge of madness levelled at the Prophet, elevating literacy and reason as divine witnesses to his sanity.
68:4
وَإِنَّكَ لَعَلَىٰ خُلُقٍ عَظِيمٍ
“And indeed, you are of a great moral character.”
The divine testimonial to the Prophet's character – A'ishah narrated that his character was the Quran itself, and this verse is the scriptural foundation for the Islamic understanding of prophetic moral exemplarity.