Musannaf Ibn Abi Shayba 13:3077

Abu Bakr narrated to us, he said: Abd al-A’la narrated to us, from Ma’mar, from al-Zuhri, from Sa’id ibn al-Musayyib, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Let no one among you prevent his neighbor from placing a piece of wood on his wall." He said: And Abu Hurayrah said: "Why do I see you turning away from it? By Allah, I will certainly cast it between your shoulders."