Yazid bin Abi Habib يزيد بن أبي حبيب · Funerals (Kitab Al-Jana'iz)

On the day of Uhud we brought the martyrs to bury them (at another place), but the crier of the Prophet (ﷺ) came and said: The Messenger of Allah (ﷺ) has commanded you to bury the martyrs at the place where they fell. So we took them back.

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.

One day the Messenger of Allah (ﷺ) went out and prayed over the martyrs of Uhud like his prayer over the dead, and then returned.