Musnad Ahmad 1153:1211

Abu al-Nadr narrated to us, from Ibn Abi Dhi'b, from al-Qasim ibn 'Abbas, from 'Abdullah ibn Nayyar al-Aslami, from 'Urwah, from 'Aishah, that she said: "A gazelle (or a piece of game) was brought to the Prophet, peace and blessings of Allah be upon him, and he divided it between the free woman and the slave woman." And she said: "My father used to divide [shares] for the free man and the slave."