Musnad Ahmad 30:1683

Surayj narrated to us, he said: Abdullah ibn Nafi’ narrated to us, from Ibn Abi Dhi’b, from Sa’id al-Maqburi, from Abu Hurayrah, who said: The Messenger of Allah, may Allah bless him and grant him peace, said: "Do not take my grave as a festival, and do not make your houses graves. And wherever you are, send blessings upon me, for your blessings reach me."