Musnad Ahmad 1153:2360

'Amir ibn Salih narrated to us, he said: Hisham ibn 'Urwah narrated to me, from his father, from 'Aishah, she said: "We used to slaughter a sheep, and the Messenger of Allah, peace and blessings of Allah be upon him, would send its limbs (parts) to the female friends of Khadijah."