The Doctrine and Covenants, Section 1:13-14

13 And the anger of the Lord is kindled, and his sword is bathed in heaven, and it shall fall upon the inhabitants of the earth.

14 And the arm of the Lord shall be revealed; and the day cometh that they who will not hear the voice of the Lord, neither the voice of his servants, neither give heed to the words of the prophets and apostles, shall be cut off from among the people;

The Doctrine and Covenants, Section 90:10-11

10 And then cometh the day when the arm of the Lord shall be revealed in power in convincing the nations, the heathen nations, the house of Joseph, of the gospel of their salvation.

11 For it shall come to pass in that day, that every man shall hear the fulness of the gospel in his own tongue, and in his own language, through those who are ordained unto this power, by the administration of the Comforter, shed forth upon them for the revelation of Jesus Christ.

Journal of Discourses, Orson Pratt 7:29

By-and-by, when the Lord has made bare his arm in signs, in great wonders, and in mighty deeds, through the instrumentality of his servants the Seventies, and through the instrumentality of the churches that shall be built up, and the nations and kingdoms of the earth have been faithfully and fully warned, and the Lord has fulfilled and accomplished all things that have been written in the Book of Mormon, and in other revelations pertaining to the preaching of the Gospel to the nations of the Gentiles and to the nations of Israel, by-and-by the Spirit of God will entirely withdraw from those Gentile nations, and leave them to themselves. Then they will find something else to do besides warring against the Saints in their midst–besides raising their sword and fighting against the Lamb of God; for then war will commence in earnest, and such a war as probably never entered into the hearts of men in our age to conceive of. No nation of the Gentiles upon the face of the whole earth but what will be engaged in deadly war, except the Latter-day Kingdom.