Sahih al-Bukhari, Book 78, Hadith 46 (In-Book) ⓘ
Narrates Ibn `Umar: Allah' Apostle said, Gabriel kept on recommending me about treating the neighbors in a kind and polite manner, so much so that I thought that he would order (me) to make them (my) heirs."
حَدَّثَنَا مُحَمَّدُ بْنُ مِنْهَالٍ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، حَدَّثَنَا عُمَرُ بْنُ مُحَمَّدٍ، عَنْ أَبِيهِ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَا زَالَ جِبْرِيلُ يُوصِينِي بِالْجَارِ حَتَّى ظَنَنْتُ أَنَّهُ سَيُوَرِّثُهُ " .
also referenced under: Hadith 6015 (DarusSalam) & Volume 8, Book 73, Hadith 44 (USC-MSA)