The Prophet ﷺ led us in prayer on the Day of Sacrifice in Madinah. Some men went forward and slaughtered their animals, assuming that the Prophet ﷺ had already slaughtered. So the Prophet ﷺ ordered anyone who had slaughtered before him to repeat the sacrifice with another animal, and instructed them not to slaughter until the Prophet ﷺ had slaughtered.
صلى بنا النبي ﷺ يوم النحر بالمدينة، فتقدم رجال فنحروا وظنوا أن النبي ﷺ قد نحر، فأمر النبي ﷺ من كان نحر قبله أن يعيد بنحر آخر، ولا ينحروا حتى ينحر النبي ﷺ.
Muslim narrated it in the Book of Sacrifices (14:1964) from Muhammad bin Hatim, who said, Muhammad bin Bakr narrated to us, Ibn Jurayj informed us, Abu Zubayr informed me, that he heard Jabir bin Abdullah say what has already been mentioned.Malik relied on this as evidence that the sacrifice is not valid except after the imam has sacrificed, while the majority held that the sacrifice is valid after the prayer, as established in other hadiths. As for the people of villages and the desert who do not perform the Eid al-Adha prayer, the time for sacrifice among them is after sunrise.As for what was narrated from Jabir bin Abdullah, that a man slaughtered a yearling kid goat before the Prophet ﷺ had prayed, and the Messenger of Allah ﷺ said, "It will not suffice for anyone after you," and he forbade them from slaughtering until they had prayed, this contains an objectionable element.Ahmad (14927), Abu Yaala (1779), and Ibn Hibban (5909) all narrated it through the hadith of Hammad bin Salama, who said, Abu Zubayr informed us, from Jabir, and mentioned it.Abu Zubayr is a mudallis and here he narrated using the ambiguous wording "an" (from), so perhaps he concealed that he took it from some weak narrators, because of the objectionable content of its text. For the Prophet ﷺ did not confirm that the man who slaughtered before the prayer was permitted to do so, to the exclusion of anyone else, rather he forbade everyone from slaughtering before the prayer, and whoever slaughtered before the prayer was to repeat it after the prayer.