1 Nephi 4:13
13 Behold the Lord slayeth the wicked to bring forth his righteous purposes. It is better that one man should perish than that a nation should dwindle and perish in unbelief.
One of the footnote references for the scripture above, about the slaying of Laban, is D&C 98:32.
Doctrine and Covenants Sections 98
23 Now, I speak unto you concerning your families—if men will smite you, or your families, once, and ye bear it patiently and revile not against them, neither seek revenge, ye shall be rewarded;
24 But if ye bear it not patiently, it shall be accounted unto you as being meted out as a just measure unto you.
25 And again, if your enemy shall smite you the second time, and you revile not against your enemy, and bear it patiently, your reward shall be an hundred fold.
26 And again, if he shall smite you the third time, and ye bear it patiently, your reward shall be doubled unto you four-fold;
27 And these three testimonies shall stand against your enemy if he repent not, and shall not be blotted out.
28 And now, verily I say unto you, if that enemy shall escape my vengeance, that he be not brought into judgment before me, then ye shall see to it that ye warn him in my name, that he come no more upon you, neither upon your family, even your children's children unto the third and fourth generation.
29 And then, if he shall come upon you or your children, or your children's children unto the third and fourth generation, I have delivered thine enemy into thine hands;
30 And then if thou wilt spare him, thou shalt be rewarded for thy righteousness; and also thy children and thy children's children unto the third and fourth generation.
31 Nevertheless, thine enemy is in thine hands; and if thou rewardest him according to his works thou art justified; if he has sought thy life, and thy life is endangered by him, thine enemy is in thine hands and thou art justified.
32 Behold, this is the law I gave unto my servant Nephi, and thy fathers, Joseph, and Jacob, and Isaac, and Abraham, and all mine ancient prophets and apostles.
33 And again, this is the law that I gave unto mine ancients, that they should not go out unto battle against any nation, kindred, tongue, or people, save I, the Lord, commanded them.
34 And if any nation, tongue, or people should proclaim war against them, they should first lift a standard of peace unto that people, nation, or tongue;
35 And if that people did not accept the offering of peace, neither the second nor the third time, they should bring these testimonies before the Lord;
36 Then I, the Lord, would give unto them a commandment, and justify them in going out to battle against that nation, tongue, or people.
37 And I, the Lord, would fight their battles, and their children's battles, and their children's children's, until they had avenged themselves on all their enemies, to the third and fourth generation.
38 Behold, this is an ensample unto all people, saith the Lord your God, for justification before me.
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