Musannaf Ibn Abi Shayba 16:1011

Abu Bakr narrated to us, he said: Ali bin Husayn narrated to us, he said: Al-Majishun, Abd al-Aziz bin Abdullah, informed us, from Ya'qub bin Utbah bin al-Mughirah bin al-Akhnas, he said: I saw al-Sa'ib, the nephew of al-Nimr, riding upon a red saddlecloth (maytharah).