Musnad Ahmad 32:421

Abu Amir narrated to us, Hisham narrated to us, from Qatadah, from Anas, that the Prophet (peace and blessings of Allah be upon him) said: "People will certainly be struck by the scorching heat of the Fire as a punishment for sins they committed. Then, Allah will admit them into Paradise by the grace of His mercy. It will be said to them: 'The Jahannamiyyun (the people of Hell).'"