2 Nephi 7

 
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This chapter is from Isaiah 50. There seems to be a consensus among serious biblical scholars that this was written during the Babylonian exile, in other words, it appears to have been written after Lehi left Jerusalem.

“Modern scholarship considers the Book of Isaiah to be an anthology, the two principal compositions of which are the Book of Isaiah proper (chapters 1-39, with some exceptions), containing the words of the prophet Isaiah himself, dating from the time of the First Temple, around 700 BCE, and Second Isaiah (Deutero-Isaiah, chapters 40-66), comprising the words of an anonymous prophet, who lived some one hundred and fifty years later, around the time of the Babylonian exile”
(RationalWiki: Book of Isaiah).

Also, considering how hard it would be to transcribe an entire chapter from Isaiah onto metal plates. Wouldn’t it make more sense for the author to reference the writings from Isaiah and perhaps provide some commentary?

-a-bom
1 Yea, for thus saith the Lord: Have I put thee away, or have I cast thee off forever? For thus saith the Lord: Where is the bill of your mother's divorcement? To whom have I put thee away, or to which of my creditors have I sold you? Yea, to whom have I sold you? Behold, for your iniquities have ye sold yourselves, and for your transgressions is your mother put away.
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2 Wherefore, when I came, there was no man; when I called, yea, there was none to answer. O house of Israel, is my hand shortened at all that it cannot redeem, or have I no power to deliver? Behold, at my rebuke I dry up the sea, I make their rivers a wilderness and their fish to stink because the waters are dried up, and they die because of thirst.
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3 I clothe the heavens with blackness, and I make sackcloth their covering.
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4 The Lord God hath given me the tongue of the learned, that I should know how to speak a word in season unto thee, O house of Israel. When ye are weary he waketh morning by morning. He waketh mine ear to hear as the learned.
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5 The Lord God hath opened mine ear, and I was not rebellious, neither turned away back.
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6 I gave my back to the smiter, and my cheeks to them that plucked off the hair. I hid not my face from shame and spitting.
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7 For the Lord God will help me, therefore shall I not be confounded. Therefore have I set my face like a flint, and I know that I shall not be ashamed.
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8 And the Lord is near, and he justifieth me. Who will contend with me? Let us stand together. Who is mine adversary? Let him come near me, and I will smite him with the strength of my mouth.
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9 For the Lord God will help me. And all they who shall condemn me, behold, all they shall wax old as a garment, and the moth shall eat them up.
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10 Who is among you that feareth the Lord, that obeyeth the voice of his servant, that walketh in darkness and hath no light?
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11 Behold all ye that kindle fire, that compass yourselves about with sparks, walk in the light of your fire and in the sparks which ye have kindled. This shall ye have of mine hand--ye shall lie down in sorrow.
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