Sayyiduna Umarah bin Ahmar al-Mazini (may Allah be pleased with him) narrates: In the Days of Ignorance I was grazing my camels when the horsemen of the Prophet (peace and blessings be upon him) attacked us. I gathered my camels and mounted a camel, but it stopped to urinate. I got down from it and mounted a she-camel, and because of that I escaped. They drove away my camels. I came to the Prophet (peace and blessings be upon him) and accepted Islam, and the Prophet (peace and blessings be upon him) returned my camels to me, which those people had not yet divided. Jawwab bin Umarah, the son of Sayyiduna Umarah (may Allah be pleased with him), narrates: My brother and I saw the she-camel on which Sayyiduna Umarah (may Allah be pleased with him) had ridden to the Prophet (peace and blessings be upon him).
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains Qutaylah bint Jumay', who narrated this report from Yazid bin Sayf, from his father. I have not seen the biography of any of them (in any book). (That is, they are unknown narrators.)
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 72