Diogenes Laertius Vitae philosophorum 8.2.69

[69] Hermippus tells us that Empedocles cured Panthea, a woman of Agrigentum, who had been given up by the physicians, and this was why he was offering sacrifice, and that those invited were about eighty in number. Hippobotus, again, asserts that, when he got up, he set out on his way to Etna; then, when he had reached it, he plunged into the fiery craters and disappeared, his intention being to confirm the report that he had become a god. Afterwards the truth was known, because one of his slippers was thrown up in the flames; it had been his custom to wear slippers of bronze. To this story Pausanias is made (by Heraclides) to take exception. ¹