The Fellowship of the Ring, “In The House of Tom Bombadil”. Tom taught the Hobbits a rhyme to sing if they should by ill-luck fall into any danger or difficulty the next day.

Ho! Tom Bombadil, Tom Bombadillo!
By water, wood and hill, by reed and willow,
By fire, sun and moon, harken now and hear us!
Come, Tom Bombadil, for our need is near us!

Provided by: NenyaGold