The Messenger of Allah ﷺ said, "Jibreel kept urging me to take care of the neighbor until I thought he would make him an heir."
حدثنا عبد الرحمن عن سفيان عن زبيد عن مجاهد
قال رسول الله ﷺ ما زال جبريل يوصيني بالجار حتى ظننت أنه مورثه
Its isnad is sahih, previously mentioned at 24823.