Sahih Bukhari Volume 007, Book 068, Hadith Number 476.
Narrated By Salama bin Al-Aqua' : The Prophet said, "Whoever has slaughtered a sacrifice should not keep anything of Its meat after three days." When it was the next year the people said, "O Allah's Apostle! Shall we do as we did last year?" He said, ' Eat of it and feed of it to others and store of it for in that year the people were having a hard time and I wanted you to help (the needy)."