Chapter 97: Oneness, Uniqueness of Allah (Tawheed)
Narrated Jundab: That he witnessed the Prophet (ﷺ) on the Day of Nahr. The Prophet (ﷺ) 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 al-Bukhari 7400