Musnad Ahmad 1153:1022

Waki’ narrated to us, Muhammad ibn ‘Imran al-Hajabi narrated to us, he said: I heard Safiyyah bint Shaybah, from ‘Aishah, she said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "What has made my name lawful and my kunyah (patronymic) unlawful? And what has made my kunyah unlawful and my name lawful?"