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

(11) Allah has not made for any man two hearts within him; nor has He made your wives whose backs you liken to the backs of your mothers as your mothers, nor has He made those whom you assert to be your sons your real sons; these are the words of your mouths; and Allah speaks the truth and He guides to the way.

(12) On that day We will set a seal upon their mouths, and their hands shall speak to Us, and their feet shall bear witness of what they earned.

(13) They desire to put out the light of Allah with their mouths but Allah will perfect His light, though the unbelievers may be averse.