Sahih Muslim 45

Abū Āmir Abd Allah bin Barrād al-Ash’arī narrated to us, Abū Usāmah narrated to us, on authority of Mufaḍḍal, on authority of Mughīrah, he said I heard ash-Sha’bī saying: ‘al-Hārith al-A’war narrated to me,’ and he [ash-Sha’bī] was testifying that he was one of the liars’.