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].
Arabic/English book reference: Book 1, Hadith 307