Sunan Ibn Majah, Volume 5, Book 33, Hadith 3674 (DarusSalam) ⓘ
It was narrated from Abu Hurayrah that the Messenger of Allah said: "Jibra'il kept enjoining good treatment of neighbours until I thought he would make neighbours heirs."
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا يُونُسُ بْنُ أَبِي إِسْحَاقَ، عَنْ مُجَاهِدٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " مَا زَالَ جِبْرَائِيلُ يُوصِينِي بِالْجَارِ حَتَّى ظَنَنْتُ أَنَّهُ سَيُوَرِّثُهُ " .
also referenced under: Hadith 3674 (Reference) & Book 33, Hadith 18 (In-Book)