Tafseer of The Most High · Al-A'laa · 87:12
[He] who will [enter and] burn in the greatest Fire,
Important: The Arabic source text is always authoritative. This translation is a study aid and has not been verified by scholars — do not use it as a basis for religious proof or for deriving rulings (ahkam). When in doubt, always consult the Arabic text and a qualified scholar.
His statement: الَّذِي يَصْلَى النَّارَ الْكُبْرَى ("who will enter the greatest Fire"). He says: he who will enter the fire of Hell (jahannam), and that is the greatest Fire. And by "the greatest" He means the intensity of the heat and the pain.