[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)  

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. (Using translation from Muslim 67)   

"اثنان في الناسِ هما بهم كُفْرٌ: الطعن في الأنساب، والنياحة على الميت".