The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
كتاب البر والصلة والآداب
(42) Chapter: Advice To Treat One's Neighbor Well
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.