The Book of Mormon, 2 Nephi 30:7-8
7 And it shall come to pass that the Jews which are scattered also shall begin to believe in Christ; and they shall begin to gather in upon the face of the land; and as many as shall believe in Christ shall also become a delightsome people.
8 And it shall come to pass that the Lord God shall commence his work among all nations, kindreds, tongues, and people, to bring about the restoration of his people upon the earth.
History of the Church, Joseph Smith 5:337
Judah must return, Jerusalem must be rebuilt, and the temple, and water come out from under the temple, and the waters of the Dead Sea be healed. It will take some time to rebuild the walls of the city and the temple, Etc.; and all this must be done before the Son of Man will make his appearance. There will be wars and rumors of wars, signs in the heavens above and on the earth beneath, the sun turned into darkness and the moon to blood, earthquakes in divers places, the seas heaving beyond their bounds; then will appear one grand sign of the Son of Man in heaven. But what will the world do? They will say it is a planet, a comet, etc. But the Son of Man, which will be as the light of the morning cometh out of the east.
Journal of Discourses, Wilford Woodruff 15:35
As I have been reading to you to-day, the Jews have got to gather to their own land in unbelief. They will go and rebuild Jerusalem and their temple. They will take their gold and silver from the nations and will gather to the Holy Land, and when they have done this and rebuilt their city, the Gentiles, in fulfillment of the words of Ezekiel, Jeremiah, and other prophets, will go up against Jerusalem to battle and to take a spoil and a prey; and then, when they have taken one-half of Jerusalem captive and distressed the Jews for the last time on the earth, their Great Deliverer, Shiloh, will come. They do not believe in Jesus of Nazareth now, nor ever will until he comes and sets his foot on Mount Olivet and it cleaves in twain, one part going towards the east, and the other towards the west. Then, when they behold the wounds in his hands and in his feet, they will say, “Where did you get them?” And he will reply, “I am Jesus of Nazareth, King of the Jews, your Shiloh, him whom you crucified.” Then, for the first time will the eyes of Judah be opened. They will remain in unbelief until that day. This is one of the events that will transpire in the latter day.
Journal of Discourses, Wilford Woodruff 18:14
The people called Millerites, believe in the second coming of the Savior, and they have set a great many days when it should take place. But he did not come; and he never will come until the revelations of God are fulfilled and a people are prepared for his coming. He will never come until the Jews are gathered home and have re-built their temple and city, and the Gentiles have gone up there to battle against them. He will never come until his Saints have built up Zion, and have fulfilled the revelations which have been spoken concerning it. He will never come until the Gentiles throughout the whole Christian world have been warned by the inspired elders of Israel.