Jeremiah 31:30 New English Translation

³⁰Rather, each person will die for his own sins. The teeth of the person who eats the sour grapes will themselves grow numb.^[a]

Jeremiah 31:30 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 it extends not just to the link between parents and children but to that between former and future behavior of the same individual. To a certain extent the principle articulated here is anticipatory of the statement in v. 34 that refers to the forgiveness of former sins.

New English Translation (NET)