What is the verse that indicates that the tongue is a scoop for what is in the heart, and by it is known what is concealed within others?

Perhaps the questioner is referring to what is stated in the verse: {Or do those in whose hearts is disease, think that Allah will not expose their [secret] ill-will? And if We willed, We could show them to you, and you would recognize them by their marks; but you would surely recognize them by the tone of [their] speech. And Allah knows your deeds.} And it is attributed to Uthman (may Allah be pleased with him) that he said: "No one conceals a secret but Allah makes it manifest on the features of his face or the slips of his tongue." And in Arab proverbs: "Every vessel leaks what is in it."