The Prophet (ﷺ) used to slaughter his sacrificial animal at the place of prayer. Ibn 'Umar used to do so.
Sunan Abi Dawud Book 16, Hadith 24
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I witnessed sacrificing along with the Messenger of Allah (ﷺ) at the place of prayer. When he finished his sermon, he descended from his pulpit, and a ram was brought to him. The Messenger of Allah (ﷺ) slaughtered it with his hand, and said: In the name of Allah, Allah, is Most Great. This is from me and from those who did not sacrifice from my community.
Sunan Abi Dawud Book 16, Hadith 23 Next Hadith → Some people of desert came at the time of sacrifice in the time of Apostle of Allah (ﷺ). The Messenger of Allah (ﷺ) said: Store up for three days and give the rest as sadaqah (alms). After than the people said to the Messenger of Allah (ﷺ): Messenger of Allah, the people used to benefit from their sacrifices, take and dissolve fat from them, and make water-bags (from their skins). The Messenger of Allah (ﷺ) said: What is that ? or whatever he said: They said: Messenger of Allah (ﷺ), you have prohibited to preserve the meat of sacrifice after three days. The Messenger of Allah (ﷺ) said: I prohibited you due to a body of people who came to you. Now eat, give it as sadaqah (alms), and store up.
Sunan Abi Dawud Book 16, Hadith 25
Sunan Abi Dawud Book 16, Hadith 23 Next Hadith → Some people of desert came at the time of sacrifice in the time of Apostle of Allah (ﷺ). The Messenger of Allah (ﷺ) said: Store up for three days and give the rest as sadaqah (alms). After than the people said to the Messenger of Allah (ﷺ): Messenger of Allah, the people used to benefit from their sacrifices, take and dissolve fat from them, and make water-bags (from their skins). The Messenger of Allah (ﷺ) said: What is that ? or whatever he said: They said: Messenger of Allah (ﷺ), you have prohibited to preserve the meat of sacrifice after three days. The Messenger of Allah (ﷺ) said: I prohibited you due to a body of people who came to you. Now eat, give it as sadaqah (alms), and store up.
Sunan Abi Dawud Book 16, Hadith 25