(1) باب سُنَّةِ الأُضْحِيَّةِ
Narrated Anas bin Malik:
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."
Reference: Sahih al-Bukhari 5546
In-book reference: Book 73, Hadith 2
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 68, Hadith 454