Plutarch De Iside et Osiride 10

[10] This is also confirmed by the most learned of the Greeks (such as Solon, Thales, Plato, Eudoxus, Pythagoras, and as some say, even Lycurgus) going to Egypt and conversing with the priests; of whom they say Eudoxus was a hearer of Chonuphis of Memphis, Solon of Sonchis of Sais, and Pythagoras of Oenuphis of Heliopolis. Whereof the last named, being (as is probable) more than ordinarily admired by the men, and they also by him, imitated their symbolical and mysterious way of talking, obscuring his sentiments with dark riddles. For the greatest part of the Pythagoric precepts fall nothing short of those sacred writings they call hieroglyphical, such as, Do not eat in a chariot; Do not sit on a choenix (or measure); Plant not a palm-tree; Stir not fire with a knife within the house. And I verily believe, that their terming the unit Apollo, the number two Diana, the number seven Minerva, and the first cube Neptune, refers to the columns set up in their temples, and to things there acted, aye, and painted too. For they represent their king and lord Osiris by an eye and a sceptre. There are some also that interpret his name by many-eyed, as if os in the Egyptian tongue signified many, and iri an eye. And the heaven, because by reason of its eternity it never grows old, they represent by a heart with a censer under it. There were also statues of judges erected at Thebes, having no hands; and the chief of them had also his eyes closed up, hereby signifying that among them justice was not to be solicited with either bribery or address. Moreover, the men of the sword had a beetle carved upon their signets, because there is no such thing as a female beetle; for they are all males, and they generate their young in certain round pellets formed of dirt, being herein as well providers of the place in which they are to be engendered, as of the matter of their nutrition.