Musnad Abu Ya'la al-Mawsili 116:9

Bahz narrated to us, Shu'bah narrated to us, Qatadah narrated to us, from Anas, who said: There was a state of alarm in Medina, so the Prophet (peace and blessings of Allah be upon him) borrowed a horse belonging to Abu Talhah called Mandub. He rode it, then said: "We have not seen any alarm, and we have found it to be a sea."