Al-Adab Al-Mufrad, Book 1, Hadith 41 (In-Book) ⓘ
Ibn 'Umar reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "The strongest form of dutifulness is when a man maintains relations with the people his father loved."
حَدَّثَنَا عَبْدُ اللهِ بْنُ يَزِيدَ، قَالَ: حَدَّثَنَا حَيْوَةُ قَالَ: حَدَّثَنِي أَبُو عُثْمَانَ الْوَلِيدُ بْنُ أَبِي الْوَلِيدِ، عَنْ عَبْدِ اللهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ، عَنْ رَسُولِ اللهِ صلى الله عليه وسلم قَالَ: إِنَّ أَبَرَّ الْبِرِّ أَنْ يَصِلَ الرَّجُلُ أَهْلَ وُدِّ أَبِيهِ.
also referenced under: Hadith 41 (Reference) & Book 1, Hadith 41 (English)