Qutaybah ibn Sa'id and Abu Kamil al-Jahdari narrated to us, both from 'Abd al-Wahid ibn Ziyad — Qutaybah said: 'Abd al-Wahid narrated to us — from al-Hasan ibn 'Ubayd Allah, who said: I heard Ibrahim say: I heard al-Aswad ibn Yazid say: 'A'ishah, may Allah be pleased with her, said: The Messenger of Allah, peace and blessings be upon him, would exert himself in worship during the last ten days [of Ramadan] as he did not exert himself at any other time.