Hadithcore
Sahih al-Bukhari, 985
sahih

Narrated Jundab:

On the day of Nahr the Prophet (ﷺ) 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."

حَدَّثَنَا مُسْلِمٌ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنِ الأَسْوَدِ، عَنْ جُنْدَبٍ، قَالَ صَلَّى النَّبِيُّ صلى الله عليه وسلم يَوْمَ النَّحْرِ ثُمَّ خَطَبَ، ثُمَّ ذَبَحَ فَقَالَ ‏

‏ مَنْ ذَبَحَ قَبْلَ أَنْ يُصَلِّيَ فَلْيَذْبَحْ أُخْرَى مَكَانَهَا، وَمَنْ لَمْ يَذْبَحْ فَلْيَذْبَحْ بِاسْمِ اللَّهِ ‏

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References2 variants
In-Book Reference
Book 13, Hadith 34
USC-MSA web (English) reference
Vol. 2, Book 15, Hadith 101 (deprecated numbering scheme)
Sharh · explanationclick to expand
The slaughtering of a sacrificial animal is one of the most significant rites of Islam. It is a public ritual in all regions; and is considered an appointed act of worship, and its time enters after the ‘Eid prayer and sermon have been performed. In this hadeeth, Jundab ibn ʿAbdullah al-Bajalee(may Allah be pleased with him) reports that the Prophet ﷺ performed the ‘Eid prayer first on the Day of Nahr. The use of the word nahr here refers to ‘Eid al-Aḍhaa, and it is often called the Day of Nahr because the pilgrims slaughter their sacrificial animals on that day, on the 10th day of DhulHijjah. The Prophet ﷺ offered the ‘Eid prayer without an adhaan or iqaamah, nor any prayers which are performed before or after it. After he ﷺ completed the prayer, he delivered the ‘Eid sermon and exhorted the people. The sermon of ‘Eid is like the sermon delivered on Fridays - and is comprised of two parts and a pause [in between both of them]; except that it is delivered after the prayer and not before it (as is the case for the sermon of Friday). After delivering the ‘Eid sermon, the Messenger of Allah ﷺ slaughtered his sacrificial animal at the Musallaa. Then, the Prophet ﷺexplained that whoever slaughtered his sacrificial animal before the ‘Eid prayer, effectively, must slaughter another in its place. This is because the first slaughtered animal did not suffice and is not considered a [completion of a] rite, nor as a ritualistic sacrifice. As for the one who did not slaughter his sacrifice before the ‘Eid prayer, then he should slaughter it after the prayer and mention the Name of Allah on it - that is to say: Let him sacrifice it to Allah, because saying bismillah (by the name of Allah) when slaughtering the animal manifests the person’s Islam; differ from those who slaughter for the sake of other things; suppress the Shayṭaan; and be blessed by His Noble Name of Allah – Exalted be He. .
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