Musannaf Ibn Abi Shayba 16:954

Abu Bakr narrated to us, he said: Abu Nu'aym narrated to us, from Qurrah ibn Khalid, from Abu Wahshiyyah al-Sayqal, who said: Mus'ab summoned me and brought out two swords to me, then said: "Which of these two is better?" I said: "This one," and upon its hilt was a bead of silver. He said: "The people say this is the sword of Abu Bakr al-Siddiq."