2-chronicles 15:12

They entered into a covenant - The covenant consisted of two parts:

1. We will seek the God of our fathers with all our heart, and with all our soul.

2. Whosoever, great or small, man or woman, will not worship the true God, and serve him alone, shall be put to death. Thus no toleration was given to idolatry, so that it must be rooted out: and that this covenant might be properly binding, they confirmed it with an oath; and God accepted them and their services.

Solemn renewals of the original covenant which God made with their fathers in the wilderness Exodus 24:3-8 occur from time to time in the history of the Jews, following upon intervals of apostasy. This renewal in the reign of Asa is the first on record. The next falls 300 years later in the reign of Josiah. There is a third in the time of Nehemiah (see the marginal references). On such occasions, the people bound themselves by a solem oath to observe all the directions of the Law, and called down God's curse upon them if they forsook it.

15:12 Into covenant - The matter of this covenant was nothing but what they were before obliged to. And tho' no promise could lay any higher obligation upon them, than they were already under, yet it would help to increase their sense of the obligation, and to arm them against temptations. And by joining all together in this, they strengthened the hands of each other