Now when Athaliah heard the noise of the people running and praising the king, she came to the people into the house of the LORD:

Jamieson-Fausset-Brown Bible Commentary

2Ch 23:12-15. Athaliah Slain.

12. Athaliah heard the noise of the people-The unusual commotion, indicated by the blast of the trumpets and the vehement acclamations of the people, drew her attention, or excited her fears. She might have flattered herself that, having slain all the royal family, she was in perfect security; but it is just as likely that, finding on reflection, one had escaped her murderous hands, she might not deem it expedient to institute any enquiries; but the very idea would keep her constantly in a state of jealous suspicion and irritation. In that state of mind, the wicked usurper, hearing across the Tyropoon the outburst of popular joy, rushed across the bridge to the temple grounds, and, penetrating from a single glance the meaning of the whole scene, raised a shriek of "Treason!"

Matthew Henry's Concise Commentary

23:12-20 A warning from God was sent to Jehoram. The Spirit of prophecy might direct Elijah to prepare this writing in the foresight of Jehoram's crimes. He is plainly told that his sin should certainly ruin him. But no marvel that sinners are not frightened from sin, and to repentance, by the threatenings of misery in another world, when the certainty of misery in this world, the sinking of their estates, and the ruin of their health, will not restrain them from vicious courses. See Jehoram here stripped of all his comforts. Thus God plainly showed that the controversy was with him, and his house. He had slain all his brethren to strengthen himself; now, all his sons are slain but one. David's house must not be wholly destroyed, like those of Israel's kings, because a blessing was in it; that of the Messiah. Good men may be afflicted with diseases; but to them they are fatherly chastisements, and by the support of Divine consolations the soul may dwell at ease, even when the body lies in pain. To be sick and poor, sick and solitary, but especially to be sick and in sin, sick and under the curse of God, sick and without grace to bear it, is a most deplorable case. Wickedness and profaneness make men despicable, even in the eyes of those who have but little religion.