On October 3, 1918 President Joseph F. Smith received his glorious vision of the spirit world-- the world we go to when we die-- and Jesus Christ's visit to it during the three days his body was in the tomb. He said that as he pondered the Spirit of the Lord had rested upon him and,
"... I saw the hosts of the dead, both small and great. And there were gathered together in one place an innumerable company of the spirits of the just... I beheld that they were filled with joy and gladness, and were rejoicing together because the day of their deliverance was at hand. They were assembled awaiting the advent of the Son of God into the spirit world, to declare their redemption from the bands of death....While this vast multitude waited and conversed, rejoicing in the hour of their deliverance from the chains of death, the Son of God appeared, declaring liberty to the captives who had been faithful;
"...And the saints rejoiced in their redemption, and bowed the knee and acknowledged the Son of God as their Redeemer and Deliverer from death and the chains of hell. Their countenances shone, and the radiance from the presence of the Lord rested upon them, and they sang praises unto his holy name.....And so it was made known among the dead, both small and great, the unrighteous as well as the faithful, that redemption had been wrought through the sacrifice of the Son of God upon the cross.
"..The dead who repent will be redeemed, through obedience to the ordinances of the house of God, And after they have paid the penatly of their transgressions, and are washed clean, shall receive a reward according to their works, for they are heirs of salvation....Thus was the vision of the redemption of the dead revealed to me, and I bear record, and I know that this record is true, through the blessing of our Lord and Savior, Jesus Christ, even so. Amen. "
Halloween, celebrated in the US on October 31st, is thought to originate from the celebration of All Saints Day (or All Hallows) the day in which people prayed for the recently deceased souls in purgatory, those who had not yet reached Heaven. The night before All Saints Day (All Hallows Eve) was the night when those souls ran loose upon the earth before they moved on to the next world.