(44) باب تَحْرِيمِ ضَرْبِ الْخُدُودِ وَشَقِّ الْجُيُوبِ وَالدُّعَاءِ بِدَعْوَى الْجَاهِلِيَّةِ
It is narrated on the authority of Abdullah b. Mas'ud that the Prophet observed:
He is not one of us (one among the Ummah of Islam) who beat the cheeks or tore the front opening of the shirt or uttered the slogans of (the days of) Jahiliya (ignorance). Ibn Numair and Abu Bakr said (instead of the word" au" (or) it is" wa" [and] the words are) and tore and uttered (the slogans) of Jahiliya without" alif".
Reference: Sahih Muslim 103 a
In-book reference: Book 1, Hadith 191
USC-MSA web (English) reference(deprecated numbering scheme): Book 1, Hadith 184