Musnad Ahmad 284:25

Isma'il ibn Ibrahim narrated to us, he said: Ayyub informed us, from 'Abdullah ibn Abi Mulaykah, from 'Abdullah ibn al-Zubayr, that 'Ali mentioned the daughter of Abu Jahl, and it reached the Prophet, peace and blessings of Allah be upon him, so he said: "Indeed, Fatimah is a piece of me; what harms her harms me, and what distresses her distresses me."