You are to say:
וְאָ֣מַרְתָּ֔ (wə·’ā·mar·tā)
Conjunctive waw | Verb - Qal - Conjunctive perfect - second person masculine singular
Strong's Hebrew 559: To utter, say

‘O mountains
הָרֵי֙ (hā·rê)
Noun - masculine plural construct
Strong's Hebrew 2022: Mountain, hill, hill country

of Israel,
יִשְׂרָאֵ֔ל (yiś·rā·’êl)
Noun - proper - masculine singular
Strong's Hebrew 3478: Israel -- 'God strives', another name of Jacob and his desc

hear
שִׁמְע֖וּ (šim·‘ū)
Verb - Qal - Imperative - masculine plural
Strong's Hebrew 8085: To hear intelligently

the word
דְּבַר־ (də·ḇar-)
Noun - masculine singular construct
Strong's Hebrew 1697: A word, a matter, thing, a cause

of the Lord
אֲדֹנָ֣י (’ă·ḏō·nāy)
Noun - proper - masculine singular
Strong's Hebrew 136: The Lord

GOD!
יְהוִ֑ה (Yah·weh)
Noun - proper - masculine singular
Strong's Hebrew 3069: YHWH

This is what
כֹּה־ (kōh-)
Adverb
Strong's Hebrew 3541: Like this, thus, here, now

the Lord
אֲדֹנָ֣י (’ă·ḏō·nāy)
Noun - proper - masculine singular
Strong's Hebrew 136: The Lord

GOD
יְ֠הוִה (Yah·weh)
Noun - proper - masculine singular
Strong's Hebrew 3069: YHWH

says
אָמַ֣ר (’ā·mar)
Verb - Qal - Perfect - third person masculine singular
Strong's Hebrew 559: To utter, say

to the mountains
לֶהָרִ֨ים (le·hā·rîm)
Preposition-l, Article | Noun - masculine plural
Strong's Hebrew 2022: Mountain, hill, hill country

and hills,
וְלַגְּבָע֜וֹת (wə·lag·gə·ḇā·‘ō·wṯ)
Conjunctive waw, Preposition-l, Article | Noun - feminine plural
Strong's Hebrew 1389: A hillock

to the ravines
לָאֲפִיקִ֣ים (lā·’ă·p̄î·qîm)
Preposition-l, Article | Noun - masculine plural
Strong's Hebrew 650: Containing, a tube, a bed, valley of a, stream, a strong thing, a hero

and valleys:
וְלַגֵּאָי֗וֹת (wə·lag·gê·’ā·yō·wṯ)
Conjunctive waw, Preposition-l, Article | Noun - common plural
Strong's Hebrew 1516: A valley

I
אֲנִ֜י (’ă·nî)
Pronoun - first person common singular
Strong's Hebrew 589: I

am about to bring
מֵבִ֤יא (mê·ḇî)
Verb - Hifil - Participle - masculine singular
Strong's Hebrew 935: To come in, come, go in, go

a sword
חֶ֔רֶב (ḥe·reḇ)
Noun - feminine singular
Strong's Hebrew 2719: Drought, a cutting instrument, as a, knife, sword

against you,
עֲלֵיכֶם֙ (‘ă·lê·ḵem)
Preposition | second person masculine plural
Strong's Hebrew 5921: Above, over, upon, against

and I will destroy
וְאִבַּדְתִּ֖י (wə·’ib·baḏ·tî)
Conjunctive waw | Verb - Piel - Conjunctive perfect - first person common singular
Strong's Hebrew 6: To wander away, lose oneself, to perish

your high places.
בָּמֽוֹתֵיכֶֽם׃ (bā·mō·w·ṯê·ḵem)
Noun - feminine plural construct | second person masculine plural
Strong's Hebrew 1116: An elevation


Additional Translations
You are to say: ‘O mountains of Israel, hear the word of the Lord GOD! This is what the Lord GOD says to the mountains and hills, to the ravines and valleys: I am about to bring a sword against you, and I will destroy your high places.And say, You mountains of Israel, hear the word of the Lord GOD; Thus said the Lord GOD to the mountains, and to the hills, to the rivers, and to the valleys; Behold, I, even I, will bring a sword on you, and I will destroy your high places.

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.

and thou shalt say, Ye mountains of Israel, hear the word of the Lord; thus saith the Lord to the mountains, and to the hills, and to the valleys, and to the forests; Behold, I bring a sword upon you, and your high places shall be utterly destroyed.

and say, Mountains of Israel, hear the word of the Lord Jehovah: thus saith the Lord Jehovah to the mountains and to the hills, to the water-courses and to the valleys: Behold, I, [even] I, do bring a sword upon you, and will destroy your high places.

and say, Ye mountains of Israel, hear the word of the Lord GOD: Thus saith the Lord GOD 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.

And say, Ye mountains of Israel, hear the word of the Lord GOD: Thus saith the Lord GOD to the 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.

and say, You mountains of Israel, hear the word of the Lord Yahweh: Thus says the Lord Yahweh to the mountains and to the hills, to the watercourses and to the valleys: Behold, I, even I, will bring a sword on you, and I will destroy your high places.

And thou hast said: Mountains of Israel, Hear ye a word of the Lord Jehovah: Thus said the Lord Jehovah To the mountains, and to the hills, To the streams, and to the valleys, Lo, I, I am bringing in against you a sword, And I have destroyed your high places. Destroy Hear High Hills Israel Mountains Places Ravines Rivers Sword Valleys Watercourses Word Destroy Hear High Hills Israel Mountains Places Ravines Rivers Sword Valleys Watercourses Word Ezekiel 6:3 NIV
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Alphabetical: a about against am and Behold bring destroy GOD going hear high hills I is Israel listen LORD mountains Myself O of on places ravines say says Sovereign sword the This Thus to valleys what will word you your

OT Prophets: Ezekiel 6:3 And say You mountains of Israel hear (Ezek. Eze Ezk) Bible Study Resources, Dictionary, Concordance and Search Tools