Verse 3
6:3 And say, Ye mountains of Israel, hear the word of the Lord GOD; Thus saith the Lord GOD to the {a} mountains, and to the hills, to the rivers, and to the valleys; Behold, I, [even] I, will bring a sword upon you, and I will destroy your high places.
(a) He speaks of all the places where the Israelites accustomed to commit their idolaters, threatening them with destruction.