Sahih Muslim Book 22, Hadith Number 4819.

Chapter : The proper time for sacrifice.Jundab b. Sufyan reported: I was with Allah's Messenger (may peace be upon him) (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 … Continue reading Sahih Muslim Book 22, Hadith Number 4819.

Sahih Muslim Book 22, Hadith Number 4831.

Chapter : The proper time for sacrifice.Al-Bara' b. 'Azib reported that Abu Burda slaughtered the animal as a sacrifice before the ('Id) prayer. Thereupon Allah's Apostle (may peace be upon him) said: Offer a substitute for it (since it does not absolve you of the responsibility of sacrifice). Thereupon he said: Allah's Messenger. I have … Continue reading Sahih Muslim Book 22, Hadith Number 4831.