وَمَآ أَدْرَىٰكَ مَا سَقَرُ
And what can make you know what is Saqar?
আপনি কি বুঝলেন অগ্নি কি?
The best of you are those who learn the Quran and teach it.(Sahih al-Bukhari 5027)
The Holy Quran › 74. Al-Muddaththir
Verse 27 of Surah Al-Muddaththir. This Surah is Meccan and has 56 ayahs; this ayah is in Juz 29.
Sahih International · মুহিউদ্দীন খান — Sources