Musnad Ahmad 30:209

Sufyan narrated to us, from Abu al-Zinad, from al-A'raj, from Abu Hurayrah, from the Prophet (peace be upon him), and 'Amr, from Yahya ibn Ja'dah: "This fire of yours is one part out of seventy parts of the fire of Hell. It was struck by the sea twice; and were it not for that, Allah would not have placed any benefit in it for anyone."