The Holy Bible, Ezekiel 47:1-8
1 Afterward he brought me again unto the door of the house; and, behold, waters issued out from under the threshold of the house eastward: for the forefront of the house stood toward the east, and the waters came down from under from the right side of the house, at the south side of the altar.
2 Then brought he me out of the way of the gate northward, and led me about the way without unto the utter gate by the way that looketh eastward; and, behold, there ran out waters on the right side.
3 And when the man that had the line in his hand went forth eastward, he measured a thousand cubits, and he brought me through the waters; the waters were to the ankles.
4 Again he measured a thousand, and brought me through the waters; the waters were to the knees. Again he measured a thousand, and brought me through; the waters were to the loins.
5 Afterward he measured a thousand; and it was a river that I could not pass over: for the waters were risen, waters to swim in, a river that could not be passed over.
6 ¶ And he said unto me, Son of man, hast thou seen this?Then he brought me, and caused me to return to the brink of the river.
7 Now when I had returned, behold, at the bank of the river were very many trees on the one side and on the other.
8 Then said he unto me, These waters issue out toward the east country, and go down into the desert, and go into the sea: which being brought forth into the sea, the watersshall be healed.
Bible Dictionary, Zechariah 14:6-9
6 And it shall come to pass in that day, that the light shall not be clear, nor dark:
7 But it shall be one day which shall be known to the Lord, not day, nor night: but it shall come to pass, that at evening time it shall be light.
8 And it shall be in that day, that living waters shall go out from Jerusalem; half of them toward the former sea, and half of them toward the hinder sea: in summer and in winter shall it be.
9 And the Lord shall be king over all the earth: in that day shall there be one Lord, and his name one.
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, &c.; and all this must be done before the Son of Man will make His appearance.