The Teachings of Zoroaster, by S.A. Kapadia, , at sacred-texts.com
Yima was known in the Shah Nameh * as Jamshid. Pride was the cause of his downfall. God conferred favours on him, and, according to the Vendidad, he became a mighty and prosperous king. Being elated by success, he disowned God, and in the words of Firdosi thus expressed himself:
This act of heresy caused his empire to crumble to pieces, and, mighty as he was, he was taken prisoner by the wicked Zohak and sawn in two between planks.
Zohak according to Firdosi, was a son of an Arabian prince. Early in life he had sold his soul to the Devil. He started his infamous reign by murdering his father. At the time when he conquered Jamshid, the Devil had bestowed on him two serpents, one on each shoulder, who had to be fed with human brains. This curse of the Devil brought terrible ruins to the soil of ancient Iran. According to the old Persian legend, Zohak was chained
up in a cave on Mount Demavend by Feridoon, who conquered and ascended the throne of Iran. Zohak is destined to remain there, a prey to anguish, till the day of judgment. Night and day he licks his iron fetters so as to thin the metal and break his bonds. A cock, placed there by the Guardian Angel, gives forth his clarion notes on the break of day, and the fetters of Zohak, rendered thin by hours of licking, with a clang and clatter immediately resume their original size. Thus once more the labour of Zohak has to be begun again. This will go on till the final trumpet call. It is the punishment to one who, in his early folly, sold his soul to the Evil One.
Gāo was a blacksmith during the reign of Zohak. His son was captured by Zohak's retainers, and was destined to feed the serpents with his brains. Gāo, in his terrible anguish to save his child such a horrible and atrocious death, tore off his leathern apron, and, waving it aloft, raised a cry for freedom from his tyrant. The band of soldiers gathered around him under Feridoon, the conqueror of Zohak and liberator of Iran, adopted his apron as the royal standard, which was handed down from generations of rulers of ancient Iran bedecked with precious stones and which was carried aloft in the forefront of numerous battles of historical renown as "Gaviani Zoondo." It proudly floated and shared all the glories of the Persian Empire and veneration of its doughty warriors.
Printed and bound by Hasell, Watson and Viney, London and Aylesbury.
103:* History of Persian kings, by the great epic poet Firdosi.