John Wesley on 2 Kings 17:9

Did secretly - This belongs, either, To their gross idolatries, and other abominable practices, which they were ashamed to own before others; or, to the worship of calves: and so the words are otherwise rendered; they covered things that were not right towards the Lord: they covered their idolatrous worship of the calves, with fair pretences of necessity, the two kingdoms being now divided, and at enmity; and of their honest intention of serving the true God, and retaining the substance of the Jewish religion. City - In all parts and places, both in cities, and in the country; yea, in the most uninhabited parts, where few or none dwell, beside the watchmen, who are left there in towers, to preserve the cattle and fruits of the earth, or to give notice of the approach of enemies.