Jamiat Tirmidhi(The Book on the Description of Hellfire – 20)

Abu Hurairah narrated that the Prophet (s.a.w) said “This Fire of yours, which the sons of Adam kindle, is one part from seventy parts of the heat of the Hell.” They said: “By Allah! Would it not have been enough O Messenger of Allah?!” He said: “It is sixty-nine parts more.