Musnad Abu Ya'la al-Mawsili 115:172

Abu Musa narrated to us, Mu'adh narrated to us, my father narrated to me, from Qatadah, from Anas, that the Prophet (peace and blessings of Allah be upon him) said: "Some people will certainly be afflicted by the scorching of the Fire as a punishment for sins they committed. Then, Allah will certainly admit them into Paradise by the grace of His mercy."