The Book of Sacrifices (Kitab Al-Adahi)

Muslim :: Book 22 : Hadith 4821

Jundab al-Bajali reported: I saw Allah's Messenger (may peace be upon him) observing ('Id) prayer on the Day of Sacrifice (10th of Dhu'l-Hijja) and then delivering a sermon and he said: He who sacrificed the (animal) before offering ('Id) prayer, he should offer again in its stead, and he who did not sacrifice the animal should slaughter it by reciting the name of Allah.