Volume 4 · Book 56 · Hadith 721
Narrated 'Abdullah (bin Mas'ud): The Prophet said, "Who-ever slaps his face or tears the bosom of his dress, or calls the calls of the Period of Ignorance, is not from us."
— Sahih Bukhari, Volume 4, Book 56: Virtues and Merits of the Prophet (pbuh) and his Companions, Hadith #721