Musnad Ahmad 1154:8

'Abd al-Razzaq narrated to us, he said: Muhammad—meaning Ibn Rashid—narrated to us, he said: Ja'far ibn 'Amr ibn Umayyah narrated to me, he said: Fatimah entered upon Abu Bakr and said: "The Messenger of Allah informed me that I am the first of his family to join him."