'Prisoner' in the Bible

Now it happened at midnight that the Lord struck every firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the prisoner who was in the dungeon, and all the firstborn of the cattle.

Jehoiachin king of Judah surrendered to the king of Babylon, he and his mother and his servants and his captains and his [palace] officials. So the king of Babylon took him prisoner in the eighth year of his [own] reign.

Let the groaning and sighing of the prisoner come before You;According to the greatness of Your power keep safe those who are doomed to die.

To hear the sighing of the prisoner,To set free those who were doomed to death,