Sahih al-Bukhari 5546
Sahih al-Bukhari · Book 73: Al-Adha Festival Sacrifice (Adaahi) · The legal way of Al-Udhiya
Narrated Anas bin Malik:
حَدَّثَنَا مُسَدَّدٌ ، حَدَّثَنَا إِسْمَاعِيلُ ، عَنْ أَيُّوبَ ، عَنْ مُحَمَّدٍ ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " مَنْ ذَبَحَ قَبْلَ الصَّلاَةِ فَإِنَّمَا ذَبَحَ لِنَفْسِهِ، وَمَنْ ذَبَحَ بَعْدَ الصَّلاَةِ فَقَدْ تَمَّ نُسُكُهُ، وَأَصَابَ سُنَّةَ الْمُسْلِمِينَ " .
The Prophet (ﷺ) said, "Whoever slaughtered the sacrifice before the prayer, he just slaughtered it for himself, and whoever slaughtered it after the prayer, he slaughtered it at the right time and followed the tradition of the Muslims."