Gathered Israel will have power over her enemies.
16 Then shall ye, who are a remnant of the house of Jacob, go forth among them; and ye shall be in the midst of them who shall be many; and ye shall be among them as a lion among the beasts of the forest, and as a young lion among the flocks of sheep, who, if he goeth through both treadeth down and teareth in pieces, and none can deliver.
17 Thy hand shall be lifted up upon thine adversaries, and all thine enemies shall be cut off.
18 And I will gather my people together as a man gathereth his sheaves into the floor.
19 For I will make my people with whom the Father hath covenanted, yea, I will make thy horn iron, and I will make thy hoofs brass. And thou shalt beat in pieces many people; and I will consecrate their gain unto the Lord, and their substance unto the Lord of the whole earth. And behold, I am he who doeth it.
20 And it shall come to pass, saith the Father, that the sword of my justice shall hang over them at that day; and except they repent it shall fall upon them, saith the Father, yea, even upon all the nations of the Gentiles.
President Joseph Fielding Smith said:
“When the Lord is speaking of His covenants, He is not confining them to the descendants of Lehi, but applies them to all the house of Israel [see 3 Nephi 20:12–18]. Are we justified in applying this merely to the Lamanites and saying that they are to go forth as a young lion pouring out vengeance upon the Gentiles? Also does the phrase, ‘Ye who are a remnant of the house of Jacob,’ in verse 16, have reference just to the Lamanites? The verses which follow indicate that it has reference to the remnants of Israel, which had been scattered in all lands. To apply it to the Lamanites in face of the entire theme of this discourse, in my judgment, narrows it too greatly. Then again, this prophecy was also given to Micah and has reference to ‘many people,’ not merely to the Gentiles on this land.”
(Doctrines of Salvation, comp. Bruce R. McConkie, 3 vols. [1954–56], 2:249.)