(20) بَابُ بِرِّ مِنْ كَانَ يَصِلُهُ أَبُوهُ
Ibn 'Umar reported that the Messenger of Allah, may Allah bless him andgrant him peace, said, "The strongest form of dutifulness is when a man maintainsrelations with the people his father loved."
Reference: Al-Adab Al-Mufrad 41
In-book reference: Book 1, Hadith 41
English translation: Book 1, Hadith 41