Ibn Mas'ud (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "He who (on befalling a calamity) slaps his cheeks, tears his clothes and follows the ways and traditions of the Days of Ignorance is none of us."[Al-Bukhari and Muslim]. (DE)
App reference (DE): Book 18, Hadith 148 (DE)
Arabic/English book reference (DE): Book 18, Hadith 1658 (DE)