And when she looked, there was the king standing by his pillar at the entrance, and the captains and the trumpeters beside the king, and all the people of the land rejoicing and blowing trumpets, and the singers with their musical instruments leading in the celebration. And Athaliah tore her clothes and cried, “Treason! Treason!”
Here we have, I. The people pleased, Ch2 23:12, Ch2 23:13. When the king stood at his pillar, whose right it was to stand there, all the people of the land rejoiced to see a rod sprung out of the stem of Jesse, Isa 11:1.
Commenting on 2 Chronicles 23:12-21
behold, the king stood at his pillar at the entering in--The king's pillar was in the people's court, opposite that of the priests'. The young king, arrayed in the royal insignia, had been brought out of the inner, to stand forth in the outer court, to the public view. Some think that he stood on the brazen scaffold of Solomon, erected beside the pillar [see on Ch2 6:13].
And she looked, and, behold, the king stood at his pillar at the entering in, and the princes and the trumpets by the king: and all the people of the land rejoiced, and sounded with trumpets, also the singers with instruments of musick, and such as taught to sing praise. Then Athaliah rent her clothes, and said, Treason, Treason.