John Gill Commentary 2 Chronicles 29:10

"Now it is in my heart to make a covenant with Jehovah, the God of Israel, that his fierce anger may turn away from us." — 2 Chronicles 29:10 (ASV)

Now it is in mine heart to make a covenant with the Lord God of Israel To renew one, as Asa and Jehoiada had done, promising to serve the Lord, and worship him according to his will:

that his fierce wrath might be turned from us ; under the tokens of which they still continued, and might expect it to break forth in other instances, unless a reformation was made.