Musannaf Ibn Abi Shayba 3:5166

Abu Khalid al-Ahmar narrated to us, from Ibn ‘Ajlan, from Suhayl ibn Husayn, from al-Hasan, 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 take your houses as graves. And send blessings upon me wherever you are, for your blessings reach me."