Where is the phrase 'Fathers ate sour grapes, and the children's teeth are set on edge' written?

Shalom Dahan,

As far as I have seen, this verse first appears in the book of Ezekiel (Chapter 18): "Fathers ate sour grapes, and the children's teeth are set on edge"—there the prophet corrects a common misunderstanding of the Torah (Numbers 14:18: "Visiting the iniquity of the fathers upon the children, unto the third and fourth generation"). In the past, some believed that according to the Torah, children are punished for the sins of their fathers, but this is not correct. The prophet corrects them, since it is explicitly stated in the Torah (Deuteronomy 24:16): "Parents shall not be put to death for their children, nor shall children be put to death for their parents; every man shall be put to death for his own sin."

Therefore, Ezekiel (Chapter 18) says: "And the word of Hashem came to me, saying: What is this that you people keep using this proverb in the land of Israel, saying, `Fathers have eaten sour grapes, and the children's teeth are set on edge'? As I live, declares the Lord Hashem, you shall no longer use this proverb in Israel. Behold, all souls are Mine; the soul of the father as well as the soul of the son is Mine. The soul who sins shall die." We see that the prophet, invoking the name of Hashem, opposes the proverb used by the people (the claim that because the fathers ate sour grapes, the children's teeth become weak). The prophet swears by the name of Hashem that this mistaken proverb will no longer be said in Israel, because we are all children of Hashem equally, and only the sinner will pay the price for his sins if he does not repent.

Jeremiah also says similarly (Chapter 31:29): "Behold, the days come, says Hashem... that they shall no longer say, 'Fathers have eaten sour grapes, and the children's teeth are set on edge.' But every one shall die for his own iniquity: every man who eats sour grapes, his own teeth shall be set on edge." Meaning that a time will come when no one will be mistaken in this regard, and no one will think for a moment that he suffers because of his parents' sins.

Blessings,
Daniel Bales.