Musnad Ahmad 30:240

Sufyan narrated to us, from Hamzah ibn al-Mughirah, from Suhayl ibn Abi Salih, from his father, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him: "O Allah, do not make my grave an idol. May Allah curse a people who took the graves of their prophets as places of worship."