Musannaf Ibn Abi Shayba 24:123

'Affan narrated to us, he said: Sulayman ibn Ahsar narrated to us, he said: Ibn 'Awn narrated to us, he said: Muslim ibn Yasar was of higher status among the people of Basra than Abu Sa'id, until he went out with Ibn al-Ash'ath, while the other [Abu Sa'id] refrained. Abu Sa'id did not cease to be in a state of loftiness because of that, while the other fell.