Musannaf Ibn Abi Shayba 35:260

Narrated to us Abd al-A’la, from Ma’mar, from al-Zuhri, from Abu Hurayrah, that the Prophet (peace and blessings of Allah be upon him) said: "None of you should prevent his brother from placing a piece of wood on his wall." Then Abu Hurayrah said: "Why do I see you turning away from it? By Allah, I will certainly cast it between your shoulders." And it was mentioned that Abu Hanifah said: "He does not have that right."