(1) باب وَقْتِهَا
Jundab b. Sufyan reported:
I was with Allah's Messenger (ﷺ) (on the occasion) of 'Id al-Adha. After he had completed the prayer with people, he found that the goats had been slaughtered, whereupon he said: He who slaughtered sacrificial animal before the prayer should slaughter a goat (again) in its stead and he who has not slaughtered he should slaughter it by reciting the name of Allah.
Reference: Sahih Muslim 1960 b
In-book reference: Book 35, Hadith 2
USC-MSA web (English) reference(deprecated numbering scheme): Book 22, Hadith 4819