Two (things) are found among men which are tantamount to unbelief: slandering one's lineage and lamentation on the dead. (Using translation from Muslim 67)
قَالَ رَسُولُ اللهِ ﷺ اثْنَتَانِ فِي النَّاسِ هُمَا بِهِمْ كُفْرٌ الطَّعْنُ فِي النَّسَبِ وَالنِّيَاحَةُ عَلَى الْمَيِّتِ
Two (things) are found among men which are tantamount to unbelief: slandering one's lineage and lamentation on the dead.
قَالَ رَسُولُ اللَّهِ ﷺ اثْنَتَانِ فِي النَّاسِ هُمَا بِهِمْ كُفْرٌ الطَّعْنُ فِي النَّسَبِ وَالنِّيَاحَةُ عَلَى الْمَيِّتِ
[Machine] The Messenger of Allah ﷺ said, "There are two things among people that are considered as disbelief: mourning loudly for the deceased and insulting lineage."
قَالَ رَسُولُ اللهِ ﷺ ثِنْتَانِ هُمَا بِالنَّاسِ كُفْرٌ نِيَاحَةٌ عَلَى الْمَيِّتِ وَطَعْنٌ فِي النَّسَبِ
Two (things) are found among men which are tantamount to unbelief: slandering one's lineage and lamentation on the dead. (Using translation from Muslim 67)
"اثنان في الناسِ هما بهم كُفْرٌ: الطعن في الأنساب، والنياحة على الميت".