Tom Bombadil’s rescue of the hobbits from the Barrow-wights contains a great image (and somewhat humorous interpretation) of a classic scene in Christian history and theology, Christ’s “harrowing of hell” of his saints (as well as of the future resurrection of the dead):
There was a loud rumbling sound, as of stones rolling and falling, and suddenly light streamed in, real light, the plain light of day. A low door-like opening appeared at the end of the chamber beyond Frodo’s feet; and there was Tom’s head (hat, feather, and all) framed against the light of the sun rising red behind him. The light fell upon the floor, and upon the faces of the three hobbits lying beside Frodo. They did not stir, but the sickly hue had left them. They looked now as if they were only very deeply asleep.
Get out, you old Wight! Vanish in the sunlight!
Shrivel like the cold mist, like the winds go wailing,
Out into the barren lands far beyond the mountains!
Come never here again! Leave your barrow empty!
Lost and forgotten be, darker than the darkness,
Where gates stand for ever shut, till the world is mended.
At these words there was a cry and part of the inner end of the chamber fell in with a crash. Then there was a long trailing shriek, fading away into an unguessable distance; and after that silence.
‘Come, friend Frodo!’ said Tom. ‘Let us get out on to clean grass! You must help me bear them.’