לָכֵ֖ן שִׁמְע֣וּ הַגּוֹיִ֑ם וּדְעִ֥י עֵדָ֖ה אֶת־אֲשֶׁר־בָּֽם׃
Therefore hear, ye nations, And know, O congregation, what is against them.
Rashi on Jeremiah
what is within them i.e., the evil that is in their hands.
לָכֵ֖ן שִׁמְע֣וּ הַגּוֹיִ֑ם וּדְעִ֥י עֵדָ֖ה אֶת־אֲשֶׁר־בָּֽם׃
Therefore hear, ye nations, And know, O congregation, what is against them.