Sayyiduna Umayr, the freed slave of Abi al-Lahm (may Allah be pleased with him), said: I was present at Khaybar with my masters. The Prophet of Allah (peace and blessings be upon him) ordered me, so I hung a sword on myself, but I was dragging it (along the ground). He (peace and blessings be upon him) was told that I was a slave, so he (peace and blessings be upon him) ordered some minor items from the goods for me.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14205