Riyad as-Salihin

Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "No one should prohibit his neighbour from placing a peg in his wall". Abu Hurairah (May Allah be pleased with him) added: Now I see you turning away from this (Sunnah), but by Allah, I shall go on proclaiming it.

[Al-Bukhari and Muslim].