1 Peter 3:19

in which also going he preached to the spirits which are in prison,

1 Peter 4:6

For to this end were the glad tidings preached to the dead also, that they might be judged, as regards men, after the flesh, but live, as regards God, after the Spirit.

Isaiah 42:7

to open the blind eyes, to bring forth the prisoner from the prison, them that sit in darkness out of the house of restraint.

Isaiah 49:9

saying to the prisoners, Go forth; to them that are in darkness, Shew yourselves. They shall feed in the ways, and their pasture shall be on all bare hills.

Isaiah 61:1

The Spirit of the Lord Jehovah is upon me, because Jehovah hath anointed me to announce glad tidings unto the meek; he hath sent me to bind up the broken-hearted, to proclaim liberty to the captives, and opening of the prison to them that are bound;

1 Peter 1:11-12

searching what, or what manner of time, the Spirit of Christ which was in them pointed out, testifying before of the sufferings which belonged to Christ, and the glories after these.

Revelation 19:10

And I fell before his feet to do him homage. And he says to me, See thou do it not. I am thy fellow-bondman, and the fellow-bondman of thy brethren who have the testimony of Jesus. Do homage to God. For the spirit of prophecy is the testimony of Jesus.

Revelation 20:7

And when the thousand years have been completed, Satan shall be loosed from his prison,

Nehemiah 9:30

And many years didst thou forbear with them, and testifiedst against them by thy Spirit through thy prophets; but they would not give ear: and thou gavest them into the hand of the peoples of the lands.

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
searching what, or what manner of time, the Spirit of Christ which was in them pointed out, testifying before of the sufferings which belonged to Christ, and the glories after these.
1 Peter 4:6
For to this end were the glad tidings preached to the dead also, that they might be judged, as regards men, after the flesh, but live, as regards God, after the Spirit.
Nehemiah 9:30
And many years didst thou forbear with them, and testifiedst against them by thy Spirit through thy prophets; but they would not give ear: and thou gavest them into the hand of the peoples of the lands.
Revelation 19:10
And I fell before his feet to do him homage. And he says to me, See thou do it not. I am thy fellow-bondman, and the fellow-bondman of thy brethren who have the testimony of Jesus. Do homage to God. For the spirit of prophecy is the testimony of Jesus.

In

Isaiah 42:7
to open the blind eyes, to bring forth the prisoner from the prison, them that sit in darkness out of the house of restraint.
Isaiah 49:9
saying to the prisoners, Go forth; to them that are in darkness, Shew yourselves. They shall feed in the ways, and their pasture shall be on all bare hills.
Isaiah 61:1
The Spirit of the Lord Jehovah is upon me, because Jehovah hath anointed me to announce glad tidings unto the meek; he hath sent me to bind up the broken-hearted, to proclaim liberty to the captives, and opening of the prison to them that are bound;
Revelation 20:7
And when the thousand years have been completed, Satan shall be loosed from his prison,