12 And it came to pass that he cried mightily unto the Lord all that day; and behold, the voice of the Lord came unto him, saying:
13 Lift up your head and be of good cheer; for behold, the time is at hand, and on this night shall the sign be given, and on the morrow come I into the world, to show unto the world that I will fulfil all that which I have caused to be spoken by the mouth of my holy prophets.
14 Behold, I come unto my own, to fulfil all things which I have made known unto the children of men from the foundation of the world, and to do the will, both of the Father and of the Son--of the Father because of me, and of the Son because of my flesh. And behold, the time is at hand, and this night shall the sign be given.
(3 Nephi 1:12-14)