Musnad Ahmad 1153:1548

'Abd al-Rahman narrated to us, he said: Sufyan narrated to us, from al-A'mash, from Ibrahim, from al-Aswad, from 'Aishah, that the Prophet, peace and blessings of Allah be upon him, "did not fast the ten [days]." 'Abd al-Rahman said: And Abu 'Awanah attributed it from al-Aswad.