Hazrat Jundub (may Allah be pleased with him) said that the Noble Prophet (peace and blessings be upon him) delivered a sermon after performing the prayer on the day of Eid al-Adha. Then he offered the sacrifice. The Prophet (peace and blessings be upon him) said: Whoever has slaughtered (the animal) before the prayer should offer another animal as a sacrifice in its place, and whoever has not slaughtered before the prayer should slaughter in the name of Allah.