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THE SECOND BOOK OF NEPHI
The Nephites separate themselves from the Lamanites, keep the law of Moses, and build a temple—Because of their unbelief, the Lamanites are cursed, receive a skin of blackness, and become a scourge unto the Nephites. [Between 588 and 559 B.C.]
21 And he had caused the cursing to come upon them, yea, even a sore cursing, because of their iniquity. For behold, they had hardened their hearts against him, that they had become like unto a flint; wherefore, as they were white, and exceedingly fair and delightsome, that they might not be enticing unto my people the Lord God did cause a skin of blackness to come upon them.
22 And thus saith the Lord God: I will cause that they shall be loathsome unto thy people, save they shall repent of their iniquities.