Musnad Abu Ya'la al-Mawsili 115:121

Al-Hasan ibn Hammad narrated to us, Abdullah ibn Idris narrated to us, from Shu'bah, from Qatadah, from Anas, who said: There was a panic in Medina, so the Messenger of Allah (peace and blessings of Allah be upon him) rode a horse belonging to Abu Talhah called Mandub. He then said: "We have not seen any panic, and we have found it to be a sea."