Sayyiduna Abu al-Yusr bin Amr al-Ansari (may Allah be pleased with him) narrates: I gave the banner to Sayyiduna Abdullah bin Rawahah (may Allah be pleased with him). He was martyred, so I gave it to Thabit bin Aqram al-Ansari (may Allah be pleased with him), and he gave that banner to Khalid bin al-Walid. Sayyiduna Khalid (may Allah be pleased with him) asked him: "Why have you given it to me?" He said: "You know more about warfare than I do."
Al-Tabarani recorded it in al-Mu'jam al-Awsat. Its chain contains a narrator, Abu Hamzah al-Thumali, who is da'if (weak).