Musnad Ahmad 32:1576

Abu Salamah narrated to us, Malik bin Anas narrated to us, from Ishaq bin Abdullah bin Abi Talhah, from Anas bin Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "A people from my nation will ride the middle of the sea—or the middle of this sea—they are like kings upon thrones," or "like kings upon thrones."