The word(s) "mouth" appears 13 time(s) in 13 verse(s) in Quran in Muhammad Pickthal translation.

(11) Allah hath not assigned unto any man two hearts within his body, nor hath He made your wives whom ye declare (to be your mothers) your mothers, nor hath He made those whom ye claim (to be your sons) your sons. This is but a saying of your mouths. But Allah saith the truth and He showeth the way.

(12) This day We seal up their mouths, and their hands speak out to Us and their feet bear witness as to what they used to earn.

(13) Fain would they put out the light of Allah with their mouths, but Allah will perfect His light however much the disbelievers are averse.