Then Jehoiada brought out the king’s son, put the crown on him, presented him with the Testimony, and proclaimed him king. They anointed him, and the people clapped their hands and declared, “Long live the king!”
Six years Athaliah tyrannised. We have not a particular account of her reign; no doubt it was of a piece with the beginning. While Jehu was extirpating the worship of Baal in Israel, she was establishing it in Judah, as appears, Ch2 24:7.
Commenting on 2 Kings 11:4-12
And when Athaliah heard the noise of the guard, and of the people,.... Their acclamations and shouts at the coronation of the king; for by this time the people had some knowledge of the affair, and ran, and came flocking to see the new king, and express their joy on this occasion, and whom they greatly praised, Ch2 23:12.
And he brought forth the king's son, and put the crown upon him, and [gave him] the testimony; and they made him king, and anointed him; and they clapped their hands, and said, God save the king. (l) That is, Joash, who had been kept secret six years. (m) Meaning, the law of God, which is his chief charge, and by which only his throne is established.