The Holy Bible, Revelation 11:11-13

11 And after three days and an half the Spirit of life from God entered into them, and they stood upon their feet; and great fear fell upon them which saw them.

12 And they heard a great voice from heaven saying unto them, Come up hither. And they ascended up to heaven in a cloud; and their enemies beheld them.

13 And the same hour was there a great earthquake, and the tenth part of the city fell, and in the earthquake were slain of men seven thousand: and the remnant were affrighted, and gave glory to the God of heaven.

Journal of Discourses, Orson Pratt 16:43

We might bring up, also, the declaration of John in relation to the two witnesses who are to prophesy about that period. They are to prophesy three and a half years, and their field of labor will be Jerusalem, after it shall have been rebuilt by the Jews. By means of their prophecies and the power of God attending them, the nations who are gathered together against Jerusalem will be kept at bay, these Prophets will hold them in check by their faith and power. By and by these nations overcome the two witnesses and, having finished their mission, they are slain, and their bodies will lie three days and a half in the streets of the city. Then a great earthquake will take place, and these two witnesses will be caught up to heaven.

The Holy Bible, Orson Pratt 18:7

And when they have fulfilled their prophecy, then the nations that have been lying before Jerusalem so long, waiting for an opportunity to destroy the city, will succeed in killing these two Prophets… But by and by, right in the midst of their rejoicing, when they think the Jews will now certainly fall a prey to them, behold there is a great earthquake, and in the midst of it these two Prophets rise from the dead, and they hear a voice up in the heavens saying–”Come up hither;” and they immediately ascend in the sight of their enemies.