From the CCC:
631 Jesus "descended into the lower parts of the earth. He who descended
is he who also ascended far above all the heavens."[475] The Apostles' Creed
confesses in the same article Christ's descent into hell and his
Resurrection from the dead on the third day, because in his Passover it
was precisely out of the depths of death that he made life spring forth:
Christ, that Morning Star, who came back from the dead, and shed his
peaceful light on all mankind, your Son who lives and reigns for ever and
ever. Amen.[476]
Paragraph I. Christ Descended into Hell
632 The frequent New Testament affirmations that Jesus was "raised from
the dead" presuppose that the crucified one sojourned in the realm of the
dead prior to his resurrection.[477] This was the first meaning given in the
apostolic preaching to Christ's descent into hell: that Jesus, like all
men, experienced death and in his soul joined the others in the realm of
the dead. But he descended there as Saviour, proclaiming the Good News to
the spirits imprisoned there.[478]
633 Scripture calls the abode of the dead, to which the dead Christ went
down, "hell" - Sheol in Hebrew or Hades in Greek - because those who are
there are deprived of the vision of God.[479] Such is the case for all the
dead, whether evil or righteous, while they await the Redeemer: which does
not mean that their lot is identical, as Jesus shows through the parable
of the poor man Lazarus who was received into "Abraham's bosom":[480] "It is
precisely these holy souls, who awaited their Saviour in Abraham's bosom,
whom Christ the Lord delivered when he descended into hell."[481] Jesus did
not descend into hell to deliver the damned, nor to destroy the hell of
damnation, but to free the just who had gone before him.[482]
634 "The gospel was preached even to the dead."[483] The descent into hell
brings the Gospel message of salvation to complete fulfilment. This is the
last phase of Jesus' messianic mission, a phase which is condensed in time
but vast in its real significance: the spread of Christ's redemptive work
to all men of all times and all places, for all who are saved have been
made sharers in the redemption.
635 Christ went down into the depths of death so that "the dead will hear
the voice of the Son of God, and those who hear will live."[484] Jesus, "the
Author of life", by dying destroyed "him who has the power of death, that
is, the devil, and [delivered] all those who through fear of death were
subject to lifelong bondage."[485] Henceforth the risen Christ holds "the
keys of Death and Hades", so that "at the name of Jesus every knee should
bow, in heaven and on earth and under the earth."[486]
Today a great silence reigns on earth, a great silence and a great
stillness. A great silence because the King is asleep. The earth trembled
and is still because God has fallen asleep in the flesh and he has raised
up all who have slept ever since the world began. . . He has gone to
search for Adam, our first father, as for a lost sheep. Greatly desiring
to visit those who live in darkness and in the shadow of death, he has
gone to free from sorrow Adam in his bonds and Eve, captive with him - He
who is both their God and the son of Eve. . . "I am your God, who for your
sake have become your son. . . I order you, O sleeper, to awake. I did not
create you to be a prisoner in hell. Rise from the dead, for I am the life
of the dead."[487]
IN BRIEF
636 By the expression "He descended into hell", the Apostles' Creed
confesses that Jesus did really die and through his death for us conquered
death and the devil "who has the power of death" (Heb 2:14).
637 In his human soul united to his divine person, the dead Christ went
down to the realm of the dead. He opened heaven's gates for the just who
had gone before him.
Paragraph 2. On the Third Day He Rose from the Dead
638 "We bring you the good news that what God promised to the fathers,
this day he has fulfilled to us their children by raising Jesus."[488] The
Resurrection of Jesus is the crowning truth of our faith in Christ, a
faith believed and lived as the central truth by the first Christian
community; handed on as fundamental by Tradition; established by the
documents of the New Testament; and preached as an essential part of the
Paschal mystery along with the cross:
Christ is risen from the dead! Dying, he conquered death; To the dead, he
has given life.[489]