Musnad Ahmad 1153:690

Hassan narrated to us, he said: Zuhayr narrated to us, he said: Abu Ishaq narrated to us, from ‘Abis ibn Rabi’ah, he said: I said to ‘Aishah: "Did the Messenger of Allah, peace and blessings of Allah be upon him, forbid the meat of the sacrificial animals after three [days]?" She said: "No, but few people were offering sacrifices from them, so he did that so that those who did not offer a sacrifice could be fed by those who did. And I have seen us storing the trotters from our sacrificial animals, then we would eat them after ten [days]."