(42) باب الْوَصِيَّةِ بِالْجَارِ وَالإِحْسَانِ إِلَيْهِ
Ibn Umar reported Allah's Messenger (ﷺ) as saying:
Gabriel impressed upon me (the kind treatment) towards the neighbour (so much) that I thought as if he would soon confer upon him the (right) of inheritance.
Reference: Sahih Muslim 2625 a
In-book reference: Book 45, Hadith 184
USC-MSA web (English) reference(deprecated numbering scheme): Book 32, Hadith 6356