He is not one of us who slaps the cheeks, splits the collars, and calls out with the calls of Jāhiliyyah (pre-Islamic era of ignorance)

The Prophet (may Allah's peace and blessings be upon him) forbade and warned against some of the practices of the people of Jāhliyyah, saying: He is not one of us: First: The one who slaps the cheeks, and the cheek is mentioned in particular because it is the part usually slapped; otherwise, slapping the rest of the face is included in the prohibition. Second: The one who splits the opened part of the garment through which the head is entered due to severe discontentment.

Third: The one who calls out with the calls of the people of Jāhiliyyah, like supplicating for ruin and destruction, wailing, lamenting, etc.