Jubayr ibn Mut'im said that he heard 'Umar ibn al-Khattab say on the minbar, "Learn your lineages so that you can maintain ties of kinship. By Allah, if there are some bad feelings between a man and his brother and he knows that there is kinship between him and that man, that will prevent him from breaking with him."
Reference: Al-Adab Al-Mufrad 72 In-book : Book 2, Hadith 26 English translation : Book 2, Hadith 72
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