رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 303
The Book of Miscellany
Rights of Neighbors
وَعَنْ اِبْنِ عُمَرَ وَعَائِشَةَ رَضِيَ اللَّه عَنْهُمَا قَالاَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ : مَا زَالَ جِبْرِيلُ يُوصِينِي بِالْجَارِ حَتَّى ظَنَنْتُ أَنَّهُ سَيُوَرِّثُهُ ((مُتَّفَقٌ عَلَيْهِ)).
Ibn 'Umar and 'Aishah (May Allah be pleased with them) reported: Messenger of Allah (ﷺ) said, "Jibril kept recommending treating neighbours with kindness until I thought he would assign a share of inheritance". [Al-Bukhari and Muslim].
Riyad as-Salihin, 303