Jeremiah 31:29-30

The Lord Will Make a New Covenant with Israel and Judah

31:29 “When that time comes, people will no longer say, ‘The parents have eaten sour grapes, but the children’s teeth have grown numb.’ ¹  31:30 Rather, each person will die for his own sins. The teeth of the person who eats the sour grapes will themselves grow numb. ² 

[31:29]  ¹ tn This word only occurs here and in the parallel passage in Ezek 18:2 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.

[31:30]  ² sn The Lord answers their charge by stating that each person is responsible for his own sin and will himself bear the consequences. Ezek 18 has a more extended treatment of this and shows that this extends not just to the link between parents and children but between former behavior and future behavior of the same individual. To a certain extent the principle articulated here is anticipatory of the statement in v. 34 which refers to the forgiveness of former sins.