كَلَّا سَيَعْلَمُونَ
No! They are going to know.
না, সত্ত্বরই তারা জানতে পারবে,
The best of you are those who learn the Quran and teach it.(Sahih al-Bukhari 5027)
Verse 4 of Surah An-Naba. This Surah is Meccan and has 40 ayahs; this ayah is in Juz 30.
Sahih International · মুহিউদ্দীন খান — Sources