1 Peter 3:19

And it was then that he went and preached to the imprisoned spirits,

1 Peter 4:6

For that was why the Good News was told to the dead also--that, after they have been judged in the body, as men are judged, they might live in the spirit, as God lives.

1 Peter 1:11-12

as they strove to discern what that time could be, to which the Spirit of Christ within them was pointing, when foretelling the sufferings that would befall Christ, and the glories that would follow.

Revelation 19:10

I prostrated myself at the feet of him who spoke to worship him, but he said to me- - 'Forbear; I am your fellow-servant, and the fellow-servant of your Brothers who bear their testimony to Jesus. Worship God. For to bear testimony to Jesus needs the inspiration of the Prophets.'

Revelation 20:7

When the thousand years are ended, Satan will be let loose 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
as they strove to discern what that time could be, to which the Spirit of Christ within them was pointing, when foretelling the sufferings that would befall Christ, and the glories that would follow.
1 Peter 4:6
For that was why the Good News was told to the dead also--that, after they have been judged in the body, as men are judged, they might live in the spirit, as God lives.
Revelation 19:10
I prostrated myself at the feet of him who spoke to worship him, but he said to me- - 'Forbear; I am your fellow-servant, and the fellow-servant of your Brothers who bear their testimony to Jesus. Worship God. For to bear testimony to Jesus needs the inspiration of the Prophets.'

In

Revelation 20:7
When the thousand years are ended, Satan will be let loose from his prison,