The word(s) "mouths" appears 12 time(s) in 12 verse(s) in Quran in Mohsin Khan translation.

(11) This Day, We shall seal up their mouths, and their hands will speak to Us, and their legs will bear witness to what they used to earn. (It is said that one's left thigh will be the first to bear the witness). [Tafsir At-Tabari,]

(12) They intend to put out the Light of Allah (i.e. the Religion of Islam, this Qur'an, and the Prophet Muhammad صلى الله عليه وسلم) with their mouths. But Allah will bring His Light to perfection even though the disbelievers hate (it).