A covenant - Rather, "the covenant," which either was already an established part of a coronation (marginal reference "k"), or at least became such afterward.

Jehoiada made a covenant - A general covenant was first made between the Lord, the Supreme King, the king his viceroy, and the people, that they should all be the Lord's people; each being equally bound to live according to the Divine law.

Then, secondly, a particular covenant was made between the king and the people, by which the king was bound to rule according to the laws and constitution of the kingdom, and to watch and live for the safety of the public. And the people were bound on their part, to love, honor, succor, and obey the king. Where these mutual and just agreements are made and maintained, there can be nothing else than prosperity in the Church and the state.

And Jehoiada made a covenant between the Lord and the king and the people, that they should be the Lord's people,.... Renewed the covenant between the Lord on the one part, and the king and the people on the other; assuring them, that as God had declared that he would be their God, he would yet be their God to bless and protect them, they continuing in obedience to him; and obliging them to promise that they would serve the Lord their God, and him only, and root out all idolatry from the land, and restore, and continue in, the pure worship of God:

between the king also and the people; he promising, on his part, that he would govern them according to the law of God, and protect them in their rights and properties, privileges and liberties; and they, on their part, that they would honour and obey him, and be his faithful subjects. In 2 Chronicles 23:16 Jehoiada is said to make this covenant between him, &c. which may be understood of the Lord; or if of himself, the meaning is, that it was made between him, the king and people, and the Lord.

Renewal of the covenant, extermination of the worship of Baal, and entrance of the king into the palace. - 2 Kings 11:17. After Jehoash was crowned and Athaliah put to death, Jehoiada concluded the covenant (1) between Jehovah on the one hand and the king and people on the other, and (2) between the king and the people. The former was simply a renewal of the covenant which the Lord had made with Israel through Moses (Exodus 24), whereby the king and the people bound themselves ליהוה לעם להיות, i.e., to live as the people of the Lord, or to keep His law (cf. Deuteronomy 4:20; Deuteronomy 27:9-10), and was based upon the "testimony" handed to the king. This covenant naturally led to the covenant between the king and the people, whereby the king bound himself to rule his people according to the law of the Lord, and the people vowed that they would be obedient and subject to the king as the ruler appointed by the Lord (cf. 2 Samuel 5:3). The renewal of the covenant with the Lord was necessary, because under the former kings the people had fallen away from the Lord and served Baal. The immediate consequence of the renewal of the covenant, therefore, was the extermination of the worship of Baal, which is mentioned at once in 2 Kings 11:18, although its proper place in order of time is after 2 Kings 11:18. All the people (הארץ כּל־עם, as in 2 Kings 11:14) went to the temple of Baal, threw down his altars, broke his images (the columns of Baal and Astarte) rightly, i.e., completely (היטב as in Deuteronomy 9:21), and slew the priest Mattan, probably the chief priest of Baal, before his altars. That the temple of Baal stood within the limits of the sanctuary, i.e., of the temple of Jehovah (Thenius), cannot be shown to be probable either from 2 Chronicles 24:7 or from the last clause of this verse. (For 2 Chronicles 24:7 see the fuller remarks on 2 Kings 12:5.) The words "and the priest set overseers over the house of Jehovah" do not affirm that Jehoiada created the office of overseer over the temple for the purpose of guarding against a fresh desecration of the temple by idolatry (Thenius), but simply that he appointed overseers over the temple, namely, priests and Levites entrusted with the duty of watching over the performance of worship according to the precepts of the law, as is more minutely described in 2 Kings 11:18, 2 Kings 11:19.

And Jehoiada made a {p} covenant between the LORD and the king and the people, that they should be the LORD'S people; between the {q} king also and the people.

(p) That both the king and the people should maintain the true worship of God and destroy all idolatry.

(q) That he should govern and they obey in the fear of God.

11:17 A covenant - A sacred covenant whereby he solemnly engaged both the king, and people, that they should be the Lord's people; that they should renounce, and root out all idolatry, and set up and maintain God's true worship. Between the king - This was a civil covenant, whereby the king engaged himself to rule them justly, and in the fear of God; and the people obliged themselves to defend and obey him.

2Ki 11:17-20. Jehoiada Restores God's Worship.

17, 18. a covenant between the Lord and the king and the people-The covenant with the Lord was a renewal of the national covenant with Israel (Ex 19:1-24:18; "to be unto him a people of inheritance," De 4:6; 27:9). The covenant between the king and the people was the consequence of this, and by it the king bound himself to rule according to the divine law, while the people engaged to submit, to give him allegiance as the Lord's anointed. The immediate fruit of this renewal of the covenant was the destruction of the temple and the slaughter of the priests of Baal (see 2Ki 10:27); the restoration of the pure worship of God in all its ancient integrity; and the establishment of the young king on the hereditary throne of Judah [2Ki 11:19].

11:17-21 King and people would cleave most firmly to each other, when both had joined themselves to the Lord. It is well with a people, when all the changes that pass over them help to revive, strengthen, and advance the interests of religion among them. Covenants are of use, both to remind us of, and bind us to, the duties already binding on us. They immediately abolished idolatry; and, pursuant to the covenant with one another, they expressed mutual readiness to help each other. The people rejoiced, and Jerusalem was quiet. The way for people to be joyful and at peace, is to engage fully in the service of God; for the voice of joy and thanksgiving is in the dwellings of the righteous, but there is no peace for the wicked.