And the children of Israel did secretly those things that were not right against the LORD their God, and they built them high places in all their cities, from the tower of the watchmen to the fenced city. Did secretly those things - There was much hidden iniquity and private idolatry among them, as well as public and notorious crimes.
From the tower of the watchmen to the fenced city - That is, the idolatry was universal; every place was made a place for some idolatrous rite or act of worship; from the largest city to the smallest village, and from the public watchtower to the shepherd's cot.