The Prophet ﷺ said "Gabriel continued to recommend me about treating the neighbors Kindly and politely so much so that I thought he would order me to make them as my heirs.  

عَنِ النَّبِيِّ ﷺ قَالَ مَا زَالَ يُوصِينِي جِبْرِيلُ بِالْجَارِ حَتَّى ظَنَنْتُ أَنَّهُ سَيُوَرِّثُهُ