Verse 9
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.