II Nephi 5:20-26 Wherefore, the word of the Lord was fulfilled which he spake unto me, saying that: Inasmuch as they will not hearken unto thy words they shall be cut off from the presence of the Lord. And behold, they were cut off from his presence. 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. And thus saith the Lord God: I will cause that they shall be loathsome unto thy people, save they shall repent of their iniquities. And cursed shall be the seed of him that mixeth with their seed; for they shall be cursed even with the same cursing. And the Lord spake it, and it was done. And because of their cursing which was upon them they did become an idle people, full of mischief and subtlety, and did seek in the wilderness for beasts of prey. And the Lord God said unto me: They shall be a scourge unto thy seed, to stir them up in remembrance of me; and inasmuch as they will not remember me, and hearken unto my words, they shall scourge them even unto destruction.
Jacob 3:5-9 Behold, the Lamanites your brethren, whom ye hate because of their filthiness and the cursing which hath come upon their skins, are more righteous than you; for they have not forgotten the commandment of the Lord, which was given unto our father – that they should have save it were one wife, and concubines they should have none, and there should not be whoredoms committed among them. And now, this commandment they observe to keep; wherefore, because of this observance, in keeping this commandment, the Lord God will not destroy them, but will be merciful unto them; and one day they shall become a blessed people. Behold, their husbands love their wives, and their wives love their husbands; and their husbands and their wives love their children; and their unbelief and their hatred towards you is because of the iniquity of their fathers; wherefore, how much better are you than they, in the sight of your great Creator? O my brethren, I fear that unless ye shall repent of your sins that their skins will be whiter than yours, when ye shall be brought with them before the throne of God. Wherefore, a commandment I give unto you, which is the word of God, that ye revile no more against them because of the darkness of their skins; neither shall ye revile against them because of their filthiness; but ye shall remember your own filthiness, and remember that their filthiness came because of their fathers.