Volume 2, Book 15, Number 101:
Narrated Jundab:
On the day of Nahr the Prophet offered the prayer and delivered the Khutba and then slaughtered
the sacrifice and said, “Anybody who slaughtered (his sacrifice) before the prayer should slaughter
another animal in lieu of it, and the one who has not yet slaughtered should slaughter the sacrifice
mentioning Allah’s name on it.”