1 Peter 3:19

in which also he went and preached to the spirits in prison,

1 Peter 4:6

And for this cause was the gospel preached also to the dead, that they might be judged according to men in the flesh, but live according to God in the Spirit.

1 Peter 1:11-12

inquiring as to what person or what time the Spirit of Christ which was in them signified, when it declared before the sufferings of Christ and after these the glories,

Revelation 19:10

And I fell before his feet to worship him. And he said to me, See [that you do it] not; I am your fellow-servant and of your brothers who have the testimony of Jesus; worship God. For the testimony of Jesus is the spirit of prophecy.

Revelation 20:7

And when the thousand years are finished, Satan shall be released from his prison,

Treasury of Scripture Knowledge

Summary

By which also he went and preached unto the spirits in prison;

Bible References

By which

1 Peter 1:11
inquiring as to what person or what time the Spirit of Christ which was in them signified, when it declared before the sufferings of Christ and after these the glories,
1 Peter 4:6
And for this cause was the gospel preached also to the dead, that they might be judged according to men in the flesh, but live according to God in the Spirit.
Revelation 19:10
And I fell before his feet to worship him. And he said to me, See [that you do it] not; I am your fellow-servant and of your brothers who have the testimony of Jesus; worship God. For the testimony of Jesus is the spirit of prophecy.

In

Revelation 20:7
And when the thousand years are finished, Satan shall be released from his prison,