Musnad Abu Ya'la al-Mawsili 155:100

Wahb ibn Baqiyyah narrated to us, Khalid ibn Abdullah informed us, from Muhammad ibn Amr, from Abu Salamah, from Abu Hurayrah, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "When Allah created Paradise and the Fire, He sent Gabriel to Paradise and said: 'Go and look at it and at what I have prepared for its people therein.' He said: So he went and looked at it, then he returned and said: 'By Your Might, I fear that no one will enter it.' Then He sent him to the Fire and said: 'Go and look at it and at what I have prepared for its people therein.' He said: So he went, and behold, it was piling upon itself. He said: 'By Your Might, no one who hears of it will enter it.' He said: So He commanded that it be surrounded by desires, then He said: 'Return and look at it and at what I have prepared for its people.' He said: So he looked at it, then he said: 'By Your Might, I fear that no one will be saved from it except that he enters it.'"