Therefore thus saith the LORD of hosts, Behold, I will punish them: the young men shall die by the sword; their sons and their daughters shall die by famine:
Behold, I will punish them - the retribution of their intended murder shall be in kind. As they plotted that Jeremiah should die by their hands, so shall they die by the hand of the Lord. Just as in Messiah's case (Psalms 69:8-28).