'Sour Grapes' in the Bible

“In those days they will not say again,‘The fathers have eaten sour grapes,And the children’s teeth are set on edge.’

But everyone will die for his own iniquity; each man who eats the sour grapes, his teeth will be set on edge.

“What do you mean by using this proverb concerning the land of Israel, saying,‘The fathers eat the sour grapes,But the children’s teeth are set on edge’?