Sunan Abu Dawud
3222
Sahih+3

Narrated Anas ibn Malik: The Prophet (ﷺ) said: There is no slaughtering (at the grave) in Islam. 'Abd al-Razzaq said: They used to slaughter cows or sheep at grave

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid