Narrated Jundab: That he witnessed the Prophet on the Day of Nahr. The Prophet offered prayer and then delivered a sermon saying, "Whoever slaughtered his sacrifice before offering prayer, should slaughter another animal in place of the first; and whoever has not yet slaughtered any, should slaughter a sacrifice and mention Allah's Name while doing so."
— Sahih Bukhari, Volume 9, Book 93: Oneness, Uniqueness of Allah (Tawheed), Hadith #497
Narrated Jundab: That he witnessed the Prophet on the Day of Nahr. The Prophet offered prayer and then delivered a sermon saying, "Whoever slaughtered his sacrifice before offering prayer, should slaughter another animal in place of the first; and whoever has not yet slaughtered any, should slaughter a sacrifice and mention Allah's Name while doing so."
This hadith is from the book of Oneness, Uniqueness of Allah (Tawheed) in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 497 in book 93 of volume 9.
