John Gill Commentary Ezekiel 6:3

"and say, Ye mountains of Israel, hear the word of the Lord Jehovah: Thus saith the Lord Jehovah to the mountains and to the hills, to the watercourses and to the valleys: Behold, I, even I, will bring a sword upon you, and I will destroy your high places." — Ezekiel 6:3 (ASV)

And say, ye mountains of Israel, hear the word of the Lord God ,
&c.] Since the people of the Jews would not hear the word of the Lord, the mountains are called upon to hear it; unless the inhabitants of the mountains are meant:

thus saith the Lord God to the mountains and to the hills, to the
rivers and to the valleys :
these are addressed, because idols were worshipped here; as upon the mountains and hills, so by rivers of water, and also in valleys, as in the valley of Hinnom idols were worshipped; upon mountains and hills, because they thought themselves nearer to heaven; by rivers, because of purity; and in valleys, because shady and obscure, and had something solemn and venerable in them:

behold I, [even] I, will bring a sword upon you ;
that is, upon the idolaters, which worshipped in these places; otherwise different instruments, as pick axes would have been more proper. The Targum paraphrases it, ``them that kill with the sword;'' meaning the Chaldeans, who doubtless are intended:

and I will destroy your high places ;
the temples and altars, built on high places, and devoted to idolatrous worship, as follows: