A solemn assembly - Jehu applies to his proposed gathering the sacred name assigned in the Law to the chiefest festivals of Yahweh (see Leviticus 23:36; Numbers 29:35; Deuteronomy 16:8).

And Jehu said, proclaim a solemn assembly for Baal,.... Such as with the Jews was an holy convocation, when they were forbidden and restrained from doing any work on that day; and such a day Jehu would have appointed and proclaimed for Baal, that the people might be at leisure to attend:

and they proclaimed it; according to his order, in Samaria.

And Jehu said, Proclaim a solemn assembly for Baal. And they proclaimed it.

Proclaim: Heb. Sanctify

10:15-28 Is thine heart right? This is a question we should often put to ourselves. I make a fair profession, have gained a reputation among men, but, is my heart right? Am I sincere with God? Jehonadab owned Jehu in the work, both of revenge and of reformation. An upright heart approves itself to God, and seeks no more than his acceptance; but if we aim at the applause of men, we are upon a false foundation. Whether Jehu looked any further we cannot judge. The law of God was express, that idolaters were to be put to death. Thus idolatry was abolished for the present out of Israel. May we desire that it be rooted out of our hearts.