The Mekhilta DeRabbi Yishmael cites a devastating passage from (II Chronicles 24:25) to illustrate the consequences of shedding innocent blood. The verse describes the downfall of King Yoash (Joash) of Judah, a ruler whose story is one of the most dramatic reversals in biblical history.
Yoash began his reign as a righteous king. He had been saved as an infant from the massacre ordered by his grandmother Athaliah, hidden in the Temple by the priest Yehoyada and his wife for six years. When Yehoyada finally led a revolt and placed the young Yoash on the throne, the boy king repaired the Temple and restored proper worship. For as long as Yehoyada lived, Yoash walked in righteous paths.
But after Yehoyada's death, everything changed. Yoash abandoned God and turned to idol worship. When Yehoyada's own son, Zechariah, stood in the Temple courtyard and rebuked the king, Yoash ordered him stoned to death. The man who had been saved by a priest's family repaid that family with murder.
The verse in Chronicles records the consequences with chilling precision: "And when they left him, for they left him with many wounds, his servants rebelled against him because of the blood of the sons of Yehoyada the Priest, and they killed him on his bed, and he died." The Mekhilta uses this verse to teach that divine justice may not come immediately, but it comes. Yoash's own servants turned against him, and the man who had murdered a prophet in the Temple was himself murdered in his own bed. The punishment mirrored the crime: betrayal repaid with betrayal, violence answered by violence.