Al-Adab Al-Mufrad, Hadith 395 ⓘ
Abu Hurayra reported that the Prophet, may Allah bless him and grant him peace, said, "There are two courses that my Community will not abandon: wailing and attacking a person's lineage."
حَدَّثَنَا أَبُو عَاصِمٍ، عَنِ ابْنِ عَجْلاَنَ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ: شُعْبَتَانِ لاَ تَتْرُكُهُمَا أُمَّتِي: النِّيَاحَةُ وَالطَّعْنُ فِي الأَنْسَابِ.
also referenced under: Book 21, Hadith 11 (In-Book) & Book 21, Hadith 395 (English)