Musnad Abu Ya'la al-Mawsili 149:18

Abu Ma'mar narrated to us, Ali bin Hashim narrated to us, from Hisham bin Urwah, from Abdullah bin Abi Bakr bin Muhammad bin Amr bin Hazm, from Amrah, from Aisha, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "That which is forbidden by birth is forbidden by breastfeeding."