Charles Ellicott Commentary 2 Chronicles 24:22

"Thus Joash the king remembered not the kindness which Jehoiada his father had done to him, but slew his son. And when he died, he said, Jehovah look upon it, and require it." — 2 Chronicles 24:22 (ASV)

The Lord look upon it, and require it — Jehovah behold, and avenge! Literally, seek, namely, vengeance for the crime (Genesis 9:5; Psalms 10:4). This dying imprecation is in harmony with the spirit of the older dispensation, which exacted blood for blood. Contrast the prayer of St. Stephen, the first of Christian martyrs (Acts 7:50). The prayer of Zechariah was also a prophecy destined to speedy fulfilment. (See 2 Chronicles 24:23 and following.)