Alma 40: 6 Now there must needs be a space betwixt the time of death and the time of the resurrection.
7 And now I would inquire what becometh of the souls of men from this time of death to the time appointed for the resurrection?
8 Now whether there is more than one time appointed for men to rise it mattereth not; for all do not die at once, and this mattereth not; all is as one day with God, and time only is measured unto men.
9 Therefore, there is a time appointed unto men that they shall rise from the dead; and there is a space between the time of death and the resurrection. And now, concerning this space of time, what becometh of the souls of men is the thing which I have inquired diligently of the Lord to know; and this is the thing of which I do know.
10 And when the time cometh when all shall rise, then shall they know that God knoweth all the times which are appointed unto man.
11 Now, concerning the state of the soul between deathand the resurrection—Behold, it has been made known unto me by an angel, that the spirits of all men, as soon as they are departed from this mortal body, yea, the spirits of all men, whether they be good or evil, are taken home to that God who gave them life.
12 And then shall it come to pass, that the spirits of those who are righteous are received into a state of happiness, which is called paradise, a state of rest, a state of peace, where they shall rest from all their troubles and from all care, and sorrow.
13 And then shall it come to pass, that the spirits of the wicked, yea, who are evil—for behold, they have no part nor portion of the Spirit of the Lord; for behold, they chose evil works rather than good; therefore the spirit of the devil did enter into them, and take possession of their house—and these shall be cast out into outer darkness; there shall be weeping, and wailing, and gnashing of teeth, and this because of their own iniquity, being led captive by the will of the devil.
14 Now this is the state of the souls of the wicked, yea, in darkness, and a state of awful, fearful looking for the fiery indignation of the wrath of God upon them; thus they remain in this state, as well as the righteous in paradise, until the time of their resurrection.
D&C 93 33-34
33 For man is spirit. The elements are eternal, and spiritand element, inseparably connected, receive a fulness of joy;
34 And when separated, man cannot receive a fulness of joy.
D7C 138:50
50 For the dead had looked upon the long absence of their spirits from their bodies as a bondage.
Moses 7: 56 - 57
56 And he heard a loud voice; and the heavens were veiled; and all the creations of God mourned; and the earth groaned; and the rocks were rent; and the saints arose, and were crowned at the right hand of the Son of Man, with crowns of glory;
57 And as many of the spirits as were in prison came forth, and stood on the right hand of God; and the remainder were reserved in chains of darkness until the judgment of the great day.
If we are faithful to our religion, when we go into the spirit world, the fallen spirits—Lucifer and the third part of the heavenly hosts that came with him, and the spirits of wicked men who have dwelt upon this earth, the whole of them combined will have no influence over our spirits. Is not that an advantage? Yes. All the rest of the children of men are more or less subject to them, and they are subject to them as they were while here in the flesh (DBY, 379). Brigham Young
Alma 34:
34 Ye cannot say, when ye are brought to that awful crisis, that I will repent, that I will return to my God. Nay, ye cannot say this; for that same spirit which doth possessyour bodies at the time that ye go out of this life, that same spirit will have power to possess your body in that eternal world.
35 For behold, if ye have procrastinated the day of your repentance even until death, behold, ye have become subjected to the spirit of the devil, and he doth seal you his; therefore, the Spirit of the Lord hath withdrawn from you, and hath no place in you, and the devil hath all power over you; and this is the final state of the wicked.