Musnad Ahmad 5:709

Yazid ibn Harun narrated to us, Sufyan ibn Husayn informed us, from al-Zuhri, from Abu Ubayd, the freed slave of Abd al-Rahman ibn Awf, who said: I heard Ali saying: "The Messenger of Allah, peace and blessings of Allah be upon him, forbade that you keep the meat of the sacrificial animals (al-adahi) beyond three days."