Musnad Ahmad 31:111

Husayn narrated to us, in the interpretation of Shayban, from Qatadah, who said: Abu al-Mutawakkil al-Naji narrated to us, from Abu Sa’id al-Khudri, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The believers will be saved from the Fire." Then he mentioned the rest of the hadith.