Yahya related to me from Malik from Abd ar-Rahman ibn al-Mujabbarthat he used to see Salim ibn Abdullah pull the cloth away fiercelyfrom the mouth of any man he saw covering his mouth while praying.
App reference: Book 1, Hadith 31
USC-MSA web (English) reference: Book 1, Hadith 31
Arabic reference: Book 1, Hadith 32