Albert Barnes 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)

The blood of the just -Jeremiah 26:7–24 exhibits priests and prophets as the prime movers in an attempt to silence the word of God by putting Jeremiah to death. Compare the margin reference to Matthew.