It is narrated from Sayyiduna Abu Shurayh al-Ka'bi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "What can a neighbour hope for from his neighbour if he does not even let him place his beam in his wall?"
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18712