Chapter 2, Part 3B - Lieh Tzu

Seeing that Shang Ch'iu Wai was a weak old man, with a weather-beaten face and clothes of no particular cut, they one and all despised him. Soon he became a regular target for their insults and ridicule, being hustled about and slapped on the back and what not. Shang Ch'iu K'ai, however, never showed the least annoyance, and at last the disciples, having exhausted their wit on him in this way, grew tired of the fun.

So, by way of a jest, they took the old man with them to the top of a cliff, and the word was passed round that whosoever dared to throw himself over would be rewarded with a hundred ounces of silver. There was an eager response, and Shang Ch'iu K'ai, in perfect good faith, was the first to leap over the edge. And lo! he was wafted down to earth like a bird on the wing, not a bone or muscle of his body being hurt.

Mr Fan's disciples, regarding this as a lucky chance, were merely surprised, but not yet moved to great wonder. Then they pointed to a bend in the foaming river below, saying: 'There is a precious pearl at the bottom of that river, which can be had for the diving.' Ch'iu K'ai again acted on their suggestion and plunged in. And when he came out, sure enough he held a pearl in his hand.

Then, at last, the whole company began to suspect the truth, and Tzu Hua gave orders that an array of costly viands and silken raiment should be prepared; then suddenly a great fire was kindled round the pile. 'If you can walk through the midst of these flames,' he said, 'you are welcome to keep what you can get of these embroidered stuffs, be it much or little, as a reward.'

Without moving a muscle of his face, Shang Ch'iu K'ai walked straight into the fire, and came back again with his garments unsoiled and his body unsinged.
~ Lionel Giles translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Lieh Tzu.