"Forgotten Books of Eden"

In the "Forgotten Books of Eden," Adam and Eve are given the covenant and a promise that Christ will come and raise them from hell. How they are given the covenant and how they are "raised" up to life in the Garden, and how they are "raised up" or "harrowed" or "resurrected" from their graves (the pit, underworld, hades, limbo, purgatory, etc.), is interesting:

"And if thou saidst, 'Give me of the Water of Life that I may drink and live'-- it cannot be this day, but on the day that I shall descend into hell, and break the gates of brass, and bruise in pieces the kingdom of iron. Then will I in mercy save thy soul and the souls of the righteous, to give them rest in My garden. And that shall be when the end of the world is come." The next two verses is derived from old Christian lore that Adam's grave was traditionally believed to be under Christ's cross, hence the "water of life" that the pre-incarnate Christ offers Adam and Eve, is a type of baptism that their remains will be given, when Christ's blood flows down onto their remains: "For My blood shall be the Water of Life unto thee, at that time, and not to thee alone, but unto all those of thy seed who shall believe in Me; that it be unto them for rest for ever." (See: The Lost Books of The Bible and the Forgotten Books of Eden, (USA, Newfoundland: World Bible Publishers, Inc., 1926 and 1927), The First Book of Adam and Eve, pp. 5-28, see Book One, chapters 3-15 and chapter xlii, verses 5-8, p. 28).

"But unto every one of us is given grace according to the measure of the gift of Christ.     UAdd a Note 
Wherefore he saith, When he ascended up on high, he led captivity captive, and gave gifts unto men. (Now that he ascended, what is it but that he also descended first into the lower parts of the earth? He that descended is the same also that ascended up far above all heavens, that he might fill all things.)" (Ephesians 4:7-10)

Salvation for the dead - LDS Version

In contrast to historic Christian versions of Christ, his Apostles, and John the Baptist preaching the gospel in the spirit prison; we have this from an earlier LDS prophet, Joseph F. Smith: "[The Savior] was sent not only to preach the gospel to those dwelling in mortality, but he was foreordained and anointed of God to open the doors of the prison house to those in bondage and to proclaim his gospel to them." (Joseph F. Smith, Gospel Doctrine, 5th edition, (1939), p. 460).

Oct. 3, 1918, during Joseph F. Smith's vision of Christ's descent, he says that "there was gathered together in one place an innumerable company of the spirits of the just, who had been faithful in the the testimony of Jesus while they lived in mortality.... [And while] 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 there he preached to them the everlasting gospel, the doctrine of the resurrection and the redemption of mankind from the fall, and from individual sins on conditions of repentance.... I percieved that the Lord went not in person among the wicked and the disobedient who had rejected the truth, to teach them; But behold, from among the righteous, he organized his forces and appointed messengers, clothed with power and authority, and commissioned them to go forth and carry the light of the gospel to them that were in darkness, even to all the spirits of men; and thus was the gospel preached to the dead." (See: Doctrine & Covenants 138:1-32).

Joseph F. Smith also wrote: "I have always believed, and still do believe with all my souls, that such men as Peter and James and the twelve disciples chosen by the Savior in his time, have been engaged all the centuries that have passed since their martyrdom for the testimony of Jesus Christ, in proclaiming liberty to the captives in the spirit world and in opening their prison doors [see D&C 138:38-50].... Their special calling and anointing of the Lord himself was to save the world, to proclaim liberty to the captives, and the opening of the prison doors to those who were bound in chains of darkness, superstition, and ignorance." (Gospel Doctrine, 460-61; see also: Teachings of Presidents of the Church, Joseph F. Smith, (Salt Lake City, Utah: The Church of Jesus Christ of Latter Day Saints, 1998), pp. 408-415).