the Prophet ﷺ said, "He who slaps his cheeks, tears his clothes and follows the ways and traditions of the Days of Ignorance is not one of us."  

قَالَ النَّبِيُّ ﷺ لَيْسَ مِنَّا مَنْ لَطَمَ الْخُدُودَ وَشَقَّ الْجُيُوبَ وَدَعَا بِدَعْوَى الْجَاهِلِيَّةِ