"For the blood of His servants shall He avenge, and vengeances will He return to His adversaries": two vengeances — one for the blood; one for the despoiling. And whence is it derived that every despoiling of Israel by the nations is accounted to them as having spilled innocent blood? From (Joel 4:2) "I will gather all of the nations, and I will bring them down to the valley of Yehoshafat and I will contend with them there for My people and My inheritance, which they scattered … (Ibid. 19) Egypt will become a desolation, and Edom a desolate desert, because of the despoiling of the children of Judah, their spilling of innocent blood in their land."
At that time (Ibid. 20-21) "And Yehudah will dwell (secure) forever … And cleanse their blood (i.e., to forgive this bloodshed by the nations) — I will not cleanse it."