Adam Clarke on 2 Kings 23:3

Stood by a pillar - He stood, על העמוד al haammud, "upon the stairs or pulpit." This is what is called the brazen scaffold or pulpit which Solomon made, and on which the kings were accustomed to stand when they addressed the people. See 2Chr 6:13, and the parallel places.

Made a covenant - This was expressed,

1. In general. To walk after Jehovah; to have no gods besides him.

2. To take his law for the regulation of their conduct.

3. In particular. To bend their whole heart and soul to the observance of it, so that, they might not only have religion without, but, piety within.

To this all the people stood up, thus giving their consent, and binding themselves to obedience.