1 Peter 4:6

1 Peter 4:6. “For this cause was the gospel preached also to them that are dead”

President Joseph Fielding Smith taught the following concerning the work of salvation for the dead:
“All those who did not have an opportunity here to receive it, who there repent and receive the gospel, shall be heirs of the celestial kingdom of God. The Savior inaugurated this great work when he went and preached to the spirits held in prison, that they might be judged according to men in the flesh (or in other words, according to the principles of the gospel) and then live according to God in the spirit, through their repentance and acceptance of the mission of Jesus Christ who died for them” (Doctrines of Salvation, comp. Bruce R. McConkie, 3 vols. [1954–56], 2:132–33).
Regarding the preaching of the gospel in the spirit world, President Lorenzo Snow taught:
“When the Gospel is preached to the spirits in prison, the success attending that preaching will be far greater than that attending the preaching of our Elders in this life. I believe there will be very few indeed of those spirits who will not gladly receive the Gospel when it is carried to them. The circumstances there will be a thousand times more favorable” (“Discourse by President Lorenzo Snow,” Millennial Star, Jan. 22, 1894, 50).