Pilgrim's Progress

Towards evening the Giant went down into the dungeon again, and, finding that they were still alive, fell into a rage and threatened them so dreadfully that Christian's courage began to fail.
But Hopeful comforted him by reminding him of the victory he had had over Apollyon, and how he had come through the Valley of the Shadow of Death.

On Saturday morning, the Giant, having had further counsel with his wife, had the prisoners into the castle yard, and, after showing them the bones and skulls of those he had already despatched, told them he would tear them into pieces within ten days. With that he beat them all the way back to the dungeon.

That night the Giant and his wife began to renew their talk about their prisoners; and the Giant wondered that he could neither by his blows nor his counsel bring them to an end.
His wife replied that she feared they lived in hope that someone would come and release them, or that they had picklocks about them.
The Giant at this resolved to search them in the morning.

But about midnight on the Saturday, Christian and Hopeful began to pray, and a little before day Christian exclaimed :
" What a fool am I thus to lie in a stinking dungeon, when I might as well walk at liberty ! I have a key in my bosom, called Promise, that will, I am persuaded, open any lock in Doubting Castle."

And he pulled it out. It opened the dungeon door, the outward door, and the iron gate.
The gate as it opened made such a creaking that it waked Giant Despair, who, hastily rising to pursue his prisoners, felt his limbs fail; for his fits took him again, so that he could by no means go after them.

Then they went on, and came to the King's highway, and so were safe, because they were out of the giant's jurisdiction.