Musannaf Ibn Abi Shaybah 7750 — Sending blessings at the grave

Ali bin Husayn saw a man who used to come to an opening by the grave of the Prophet (peace and blessings be upon him), go into it and supplicate. He called him and said: Shall I not tell you a hadith that my father narrated from my grandfather, that the Prophet (peace and blessings be upon him) said: "Do not make my grave a place of festive gathering, and do not make your houses graveyards. Send blessings upon me, for your blessings and greetings of peace reach me wherever you are."