Commentaries:
King Jehoash (or Joash) of Judah, though he overcame much and did many good things, did not quite have the fortitude to rid the kingdom of its high places. To understand him, one must begin with his grandmother, Athaliah, the daughter of King Ahab of Israel and his queen, Jezebel, perhaps the most wicked royal couple ever to rule over God's people. Athaliah was thus actually of the house of Israel, though she married into the house of Judah when she became the wife of Jehoram (or Joram).
This union bore evil fruit, for, like his ancestor Solomon, Jehoram could not resist the negative influence of his wife and her family. Jehoram "walked in the ways of the house of Ahab, for his mother advised him to do wickedly. Therefore he did evil in the sight of the LORD, like the house of Ahab; for they were his counselors after the death of his father, to his destruction" (II Chronicles 22:3-4).
After Jehoram's death, his son, Ahaziah, reigned in his place, but only for one year (II Kings 8:26). His short reign was a continuation of his father's, as "he walked in the way of the house of Ahab, and did evil in the sight of the LORD, like the house of Ahab, for he was the son-in-law of the house of Ahab" (II Kings 8:27).
After Ahaziah's death, his mother, Athaliah, had the male heirs killed and unlawfully made herself queen. However, before she could kill Ahaziah's son, Jehoash, Ahaziah's sister hid him in the Temple, where he remained for six years while Athaliah ruled over Judah. When Jehoash was seven, though, Jehoiada the priest—his uncle—crowned him as king and had Athaliah put to death (II Kings 11:4-16; II Chronicles 23:1-15). Also at that time, the people of Judah—likely under Jehoiada's direction—tore down the temple of Baal, broke its altars and images, and killed the priest of Baal (II Kings 11:17-18; II Chronicles 23:16-17).
David C. Grabbe
The High Places (Part Two)