Charles Ellicott Commentary Lamentations 4:13

"[It is] because of the sins of her prophets, [and] the iniquities of her priests, That have shed the blood of the just in the midst of her." — Lamentations 4:13 (ASV)

That have shed the blood of the just ... —The words point to incidents like the death of Zechariah the son of Jehoiada (2 Chronicles 24:21); the “innocent blood” shed by Manasseh (2 Kings 21:16); the attempts on Jeremiah’s own life (Jeremiah 26:7); possibly to some unrecorded atrocities during the siege on the part of the priests and false prophets, who looked on the true prophets as traitors (Jeremiah 26:23).