Charles Ellicott Commentary 2 Kings 17:8

"and walked in the statutes of the nations, whom Jehovah cast out from before the children of Israel, and of the kings of Israel, which they made." — 2 Kings 17:8 (ASV)

Statutes of the heathen ... and of the kings of Israel. —The national guilt was twofold. It comprised:

1. Idolatry in the strict sense—i.e., worship of other gods than Jehovah.
2. A heathenish mode of worshipping Jehovah Himself—namely, under the form of a bullock, as Jeroboam I had ordained.

The term “statutes” means religious rules or ordinances. (Compare Exodus 12:14, “statutes; ”Leviticus 20:23, “manners; ” 1 Kings 3:3, “ordinance.”)

Which they had made — i.e., the statutes which the kings of Israel had made. (Compare 2 Kings 17:19b).