Volume 7, Book 68, Number 453:
Narrated Al-Bara:
The Prophet said (on the day of Idal-Adha), “The first thing we will do on this day of ours, is to of –
fer the (‘Id) prayer and then return to slaughter the sacrifice. Whoever does so, he acted according to
our Sunna (tradition), and whoever slaughtered (the sacrifice) before the prayer, what he offered
was just meat he presented to his family, and that will not be considered as Nusak (sacrifice).” (On
hearing that) Abu Burda bin Niyar got up, for he had slaughtered the sacrifice before the prayer, and
said, “I have got a six month old ram.” The Prophet said, ‘Slaughter it (as a sacrifice) but it will not be
sufficient for any-one else (as a sacrifice after you). Al-Bara’ added: The Prophet said, “Whoever
slaughtered (the sacrifice) after the prayer, he slaughtered it at the right time and followed the tradi –
tion of the Muslims.”