Al-Adha Festival Sacrifice (Adaahi)

Bukhari :: Book 7 :: Volume 68 :: Hadith 469

Narrated Jundab bin Sufyan Al-Bajali:

I witnessed the Prophet on the Day of Nahr. He said, "Whoever slaughtered the sacrifice before offering the 'Id prayer, should slaughter another sacrifice in its place; and whoever has not slaughtered their sacrifice yet, should slaughter now."