Yehezkiel 12:22

12:22 “Son of man, what is this proverb you have in the land of Israel, ‘The days pass slowly, and every vision fails’?

Yehezkiel 18:2

18:2 “What do you mean by quoting this proverb concerning the land of Israel,

“‘The fathers eat sour grapes

And the children’s teeth become numb?’ ¹ 

[18:2]  ¹ tn This word only occurs here and in the parallel passage in Jer 31:29-30 in the Qal stem and in Eccl 10:10 in the Piel stem. In the latter passage it refers to the bluntness of an ax that has not been sharpened. Here the idea is of the “bluntness” of the teeth, not from having ground them down due to the bitter taste of sour grapes but to the fact that they have lost their “edge,” “bite,” or “sharpness” because they are numb from the sour taste. For this meaning for the word, see W. L. Holladay, Jeremiah (Hermeneia), 2:197.