Musannaf Ibn Abi Shayba 16:679

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Hisham ibn al-Ghazz narrated to us, from ‘Ubadah ibn Nasi, from Salman, that he had a cloak made of ‘aba’ (coarse wool) while he was the leader of the people.