New Revised Standard Version
And you shall know that I am the LORD, when their slain lie among their idols around their altars, on every high hill, on all the mountain tops, under every green tree, and under every leafy oak, wherever they offered pleasing odor to all their idols.

Contemporary English Version
These people used to offer incense to idols at altars built on hills and mountaintops and in the shade of large oak trees. But when they see dead bodies lying around those altars, they will know that I am the LORD.

New American Bible
They shall know that I am the LORD, when their slain lie among their idols, all around their altars, on every high hill and mountaintop, beneath every green tree and leafy oak —any place they offer sweet-smelling oblations to all their idols.

Douay-Rheims Bible
And you shall know that I am the Lord, when your slain shall be amongst your idols, round about your altars, in every high hill, and on all the tops of mountains, and under every woody tree, and under every thick oak, the place where they burnt sweet smelling frankincense to all their idols.

And you shall know that I am the Lord, when your slain shall be amongst your idols, round about your altars, in every high hill, and on all the tops of mountains, and under every woody tree, and under every thick oak, the place where they burnt sweet smelling frankincense to all their idols.

when

Ezekiel 6:4-7 And I will throw down your altars, and your idols shall be broken in pieces: and I will cast down your slain before your idols. . . .

Isaiah 37:20,36-38 And now, O Lord our God, save us out of his hand: and let all the kingdoms of the earth know, that thou only art the Lord. . . .

upon

Ezekiel 20:28 And I had brought them into the land, for which I lifted up my hand to give it them: they saw every high hill, and every shady tree, and there they sacrificed their victims: and there they presented the provocation of their offerings, and there they set their sweet odours, and poured forth their libations.

1 Kings 14:23 For they also built them altars, and statues, and groves, upon every high hill, and under every green tree:

2 Kings 16:4 He sacrificed also, and burnt incense in the high places, and on the hills, and under every green tree.

Isaiah 1:29 For they shall be confounded for the idols, to which they have sacrificed: and you shall be ashamed of the gardens which you have chosen.

Isaiah 57:5-7 Who seek your comfort in idols under every green tree, sacrificing children in the torrents, under the high rocks? . . .

Isaiah 65:3,4 A people that continually provoke me to anger before my face, that immolate in gardens, and sacrifice upon bricks. . . .

Isaiah 66:17 They that were sanctified, thought themselves clean in the gardens behind the gate within, they that did eat swine's flesh, and the abomination, and the mouse: they shall be consumed together, saith the Lord.

Jeremiah 2:20 Of old time thou hast broken my yoke, thou hast burst my bands, and thou saidst: I will not serve. For on every high hill, and under every green tree thou didst prostitute thyself.

Jeremiah 3:6 And the Lord said to me in the days of king Josias: Hast thou seen what rebellious Israel hath done? she hath gone of herself upon every high mountain, and under every green tree, and hath played the harlot there.

Hosea 4:13 They offered sacrifice upon the tops of the mountains, and burnt incense upon the hills: under the oak, and the poplar, and the turpentine tree, because the shadow thereof was good: therefore shall your daughters commit fornication, and your spouses shall be adulteresses.