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Translation
Prometheus went to the mortals and said: "You must sacrifice an ox to Zeus, the king of gods. However, I want you to wrap the tastiest meat inside the stomach and cover the bones with delicious fat."
As Prometheus expected, when humans offered their gifts to Zeus, he chose the rich fat from the ox's stomach, unaware that the fat was hiding dry bones.
Zeus was enraged that Prometheus had deceived him, depriving him of the best part of the animal - but the damage was done. From that day on, mortals only gave the leftovers from sacrifices to the gods and kept the meat for themselves.
Zeus, to punish them, decided to deprive them of fire.
Without fire, mortals could not keep warm or cook. However, Prometheus believed this was unfair, so he secretly took a small flame from Olympus down to earth, hidden in a fennel stalk, and gave fire to humans.
Zeus, furious, found only bones inside the fat that mortals offered him.