1 Peter 3:19

In which spirit, he also went and preached unto the spirits that were in prison,

1 Peter 4:6

For unto this purpose, verily, was the gospel preached unto the dead; that they should be condemned of men in the flesh, but should live before God in the spirit.

Isaiah 42:7

That thou mayest open the eyes of the blind; let out the prisoners, and them that sit in darkness, out of the dungeon house.

Isaiah 49:9

That thou mayest say to the prisoners, "Go forth," and to them that are in darkness, "Come into the light." That they may feed in the high ways, and get their living in all places.

Isaiah 61:1

The spirit of the LORD God is with me, for the LORD hath anointed me, and sent me to preach good tidings unto the poor: that I might bind up the wounded hearts, that I might preach deliverance to the captive, and open the prison to them that are bound;

1 Peter 1:11-12

searching when, or at what time, the spirit of Christ which was in them should signify - which spirit testified before - the passions that should come unto Christ, and the glory that should follow after.

Revelation 19:10

And I fell at his feet, to worship him. And he said unto me, "See thou do it not. For I am thy fellow servant, and one of thy brethren, and of them that 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 expired, Satan shall be loosed out of his prison,

Nehemiah 9:30

And many years didst thou forbear them, and testified unto them through thy spirit, even by the office of thy prophets, and yet would they not hear. Therefore gavest thou them into the hand of the nations in 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 when, or at what time, the spirit of Christ which was in them should signify - which spirit testified before - the passions that should come unto Christ, and the glory that should follow after.
1 Peter 4:6
For unto this purpose, verily, was the gospel preached unto the dead; that they should be condemned of men in the flesh, but should live before God in the spirit.
Nehemiah 9:30
And many years didst thou forbear them, and testified unto them through thy spirit, even by the office of thy prophets, and yet would they not hear. Therefore gavest thou them into the hand of the nations in the lands.
Revelation 19:10
And I fell at his feet, to worship him. And he said unto me, "See thou do it not. For I am thy fellow servant, and one of thy brethren, and of them that have the testimony of Jesus. Worship God. For the testimony of Jesus is the spirit of prophecy."

In

Isaiah 42:7
That thou mayest open the eyes of the blind; let out the prisoners, and them that sit in darkness, out of the dungeon house.
Isaiah 49:9
That thou mayest say to the prisoners, "Go forth," and to them that are in darkness, "Come into the light." That they may feed in the high ways, and get their living in all places.
Isaiah 61:1
The spirit of the LORD God is with me, for the LORD hath anointed me, and sent me to preach good tidings unto the poor: that I might bind up the wounded hearts, that I might preach deliverance to the captive, and open the prison to them that are bound;
Revelation 20:7
And when the thousand years are expired, Satan shall be loosed out of his prison,