Charles Ellicott Commentary 2 Kings 21:4

"And he built altars in the house of Jehovah, whereof Jehovah said, In Jerusalem will I put my name." — 2 Kings 21:4 (ASV)

He built altars — that is, idolatrous altars (2 Kings 21:5).

In the house of the Lord — that is, in its two courts. This verse contains the general statement of what is particularised in 2 Kings 21:5.

In Jerusalem will I put my name. — See 1 Kings 14:21.