Sahih al-Bukhari Book 73, Hadith 29
(in continuation of above). Then I witnessed (the 'Its) with `Ali bin Abi Talib, and he too offered the `Id prayer before the sermon
and then delivered the sermon before the people and said, "Allah's Messenger (ﷺ) has forbidden you to eat
the meat of your sacrifices for more than three days."
(in continuation of above). Then I witnessed the `Id with `Uthman bin `Affan, and that was on a Friday. He offered the prayer before the sermon, saying, "O people! Today you have two 'Its (festivals) together, so whoever of those who live at Al-`Awali (suburbs) would like to wait for the Jumua prayer, he may wait, and whoever would like to return (home) Is granted my permission to do so."
`Abdullah bin `Umar said, "Allah's Messenger (ﷺ) said, "Eat of the meat of sacrifices (of `Id al Adha) for three days." When `Abdullah departed from Mina, he used to eat (bread with) oil, lest he should eat of the meat of Hadi (which is regarded as unlawful after the three days of the `Id).