Mukhtasar Bukhari (Abridged) 2130 — Conditions of Paradise and Hell

Narrated by Sayyiduna Nu'man bin Bashir (may Allah be pleased with him): I heard the Noble Prophet (peace and blessings be upon him) say: "On the Day of Resurrection, the person with the lightest punishment will be the one under whose feet two embers will be placed, and because of them his brain will boil just as a pot boils."