Mouths are mentioned in the Quran in these verses:
[3:118] O you who believe, do not befriend outsiders who never cease to wish you harm; they even wish to see you suffer. Hatred flows out of their mouths and what they hide in their chests is far worse. We thus clarify the revelations for you, if you understand.
[3:167] And to expose the hypocrites who were told, “Come fight in the cause of God, or contribute.” They said, “If we knew how to fight, we would have joined you.” They were closer to disbelief then than they were to belief. They uttered with their mouths what was not in their hearts. God knows what they conceal.
[5:41] O you messenger, do not be saddened by those who hasten to disbelieve among those who say, “We believe,” with their mouths, while their hearts do not believe. Among the Jews, some listened to lies. They listened to people who never met you, and who distorted the words out of context, then said, “If you are given this, accept it, but if you are given anything different, beware.” Whomever God wills to divert, you can do nothing to help him against God. God does not wish to cleanse their hearts. They have incurred humiliation in this world, and in the Hereafter, they will suffer a terrible retribution.
[9:30] The Jews said, “Ezra is the son of God,” while the Christians said, “Jesus is the son of God!” These are blasphemies uttered by their mouths. They thus match the blasphemies of those who have disbelieved in the past. God condemns them. They have surely deviated.
[9:31] They have set up their religious leaders and scholars as lords, instead of God. Others deified the Messiah, son of Mary. They were all commanded to worship only one god. There is no god except He. Be He glorified, high above having any partners.
[9:32] They want to put out God’s light with their mouths, but God insists upon perfecting His light, in spite of the disbelievers.
[13:14] Imploring Him is the only legitimate supplication, while the idols they implore beside Him cannot ever respond. Thus, they are like those who stretch their hands to the water, but nothing reaches their mouths. The supplications of the disbelievers are in vain.
[18:5] They possess no knowledge about this, nor did their parents. What a blasphemy coming out of their mouths! What they utter is a gross lie.
[24:15] You fabricated it with your own tongues, and the rest of you repeated it with your mouths without proof. You thought it was simple, when it was, according to God, gross.
[36:65] On that day we will seal their mouths; their hands and feet will bear witness to everything they had done.
[61:8] They wish to put out God’s light with their mouths. But God insists upon perfecting His light, in spite of the disbelievers.
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