Ezekiel 34:6

34:6 My sheep wandered over all the mountains and on every high hill. My sheep were scattered over the entire face of the earth with no one looking or searching for them.

Ezekiel 6:13

6:13 Then you will know that I am the Lord – when their dead lie among their idols around their altars, on every high hill and all the mountaintops, under every green tree and every leafy oak, ¹  the places where they have offered fragrant incense to all their idols.

Ezekiel 20:28

20:28 I brought them to the land which I swore ²  to give them, but whenever they saw any high hill or leafy tree, they offered their sacrifices there and presented the offerings that provoke me to anger. They offered their soothing aroma there and poured out their drink offerings.

[6:13]  ¹ sn By referring to every high hill…all the mountaintops…under every green tree and every leafy oak Ezekiel may be expanding on the phraseology of Deut 12:2 (see 1 Kgs 14:23; 2 Kgs 16:4; 17:10; Jer 2:20; 3:6, 13; 2 Chr 28:4).

[20:28]  ¹ tn Heb “which I lifted up my hand.”