THE SCENE: Did Prometheus get his liver ripped out every day because he brought fire to mankind? Or was it just because he tried to trick Zeus into eating some sub-optimum meat?
THE TEXT: When the gods and mortal men had a dispute at Mecone, even then Prometheus was forward to cut up a great ox and set portions before them, trying to befool the mind of Zeus. Before the rest he set flesh and inner parts thick with fat upon the hide, covering them with an ox paunch; but for Zeus he put the white bones dressed up with cunning art and covered with shining fat. Then the father of men and of gods said to him: `Son of Iapetus, most glorious of all lords, good sir, how unfairly you have divided the portions!’
So said Zeus whose wisdom is everlasting, rebuking him. But wily Prometheus answered him, smiling softly and not forgetting his cunning trick:
`Zeus, most glorious and greatest of the eternal gods, take which ever of these portions your heart within you bids.’ So he said, thinking trickery. But Zeus, whose wisdom is everlasting, saw and failed not to perceive the trick, and in his heart he thought mischief against mortal men which also was to be fulfilled. With both hands he took up the white fat and was angry at heart, and wrath came to his spirit when he saw the white ox-bones craftily tricked out: and because of this the tribes of men upon earth burn white bones to the deathless gods upon fragrant altars. But Zeus who drives the clouds was greatly vexed and said to him:
`Son of Iapetus, clever above all! So, sir, you have not yet forgotten your cunning arts!’
So spake Zeus in anger, whose wisdom is everlasting; and from that time he was always mindful of the trick, and would not give the power of unwearying fire to the Melian race of mortal men who live on the earth. But the noble son of Iapetus (Prometheus) outwitted him and stole the far-seen gleam of unwearying fire in a hollow fennel stalk. And Zeus who thunders on high was stung in spirit, and his dear heart was angered when he saw amongst men the far-seen ray of fire.
So it is not possible to deceive or go beyond the will of Zeus; for not even the son of Iapetus, kindly Prometheus, escaped his heavy anger, but of necessity strong bands confined him, although he knew many a wile.
And ready-witted Prometheus he bound with inextricable bonds, cruel chains, and drove a shaft through his middle, and set on him a long- winged eagle, which used to eat his immortal liver; but by night the liver grew as much again everyway as the long-winged bird devoured in the whole day. That bird Heracles, the valiant son of shapely-ankled Alcmene, slew; and delivered the son of Iapetus from the cruel plague, and released him from his affliction — not without the will of Olympian Zeus who reigns on high, that the glory of Heracles the Theban-born might be yet greater than it was before over the plenteous earth. This, then, he regarded, and honoured his famous son; though he was angry, he ceased from the wrath which he had before because Prometheus matched himself in wit with the almighty son of Cronos.
– Theogany, Hesiod, 8th Century BC