Mukhtasar Muslim (Abridged) 464 — Not of us: striking face and tearing

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings of Allah be upon him) said: He is not one of us who strikes his cheeks, tears his collar, or speaks the words of the days of ignorance (disbelief). In another narration, the word "or" is replaced with "and".