Did Hezekiah king of Judah and all Judah put him at all to death? did he not fear the LORD, and besought the LORD, and the LORD repented him of the evil which he had pronounced against them? Thus might we procure great evil against our souls.
Hezekiah, so far from killing him, was led to "fear the Lord," and pray for remission of the sentence against Judah (2 Chronicles 32:26).
The Lord repented - (Exodus 32:14; 2 Samuel 24:16).
Thus - if we kill Jeremiah.