Musnad Ahmad 949:14

Bahz narrated to us, Hammad ibn Salamah narrated to us, from Sa'id ibn Jumhan, from Safinah, who said: We were on a journey. He said: Whenever a man became exhausted, he would cast his garments, his shield, or his sword upon me, until I was carrying a great deal of that. He said: Then the Prophet, peace and blessings of Allah be upon him, said: "You are Safinah (a ship)."