Plato, Laws 782c

τὸ δὲ μὴν θύειν ἀνθρώπους ἀλλήλους ἔτι καὶ νῦν παραμένον ὁρῶμεν πολλοῖς· καὶ τοὐναντίον ἀκούομεν ἐν ἄλλοις, ὅτε οὐδὲ βοὸς ἐτόλμων μὲν γεύεσθαι, θύματά τε οὐκ ἦν τοῖς θεοῖσι ζῷα, πέλανοι δὲ καὶ μέλιτι καρποὶ δεδευμένοι καὶ τοιαῦτα ἄλλα ἁγνὰ θύματα, σαρκῶν δʼ ἀπείχοντο ὡς οὐχ ὅσιον ὂν ἐσθίειν οὐδὲ τοὺς τῶν θεῶν βωμοὺς αἵματι μιαίνειν, ἀλλὰ Ὀρφικοί τινες λεγόμενοι βίοι ἐγίγνοντο ἡμῶν τοῖς τότε, ἀψύχων μὲν ἐχόμενοι πάντων, ἐμψύχων δὲ τοὐναντίον

The custom of men sacrificing one another is, in fact, one that survives even now among many peoples; whereas amongst others we hear of how the opposite custom existed, when they were forbidden so much as to eat an ox, and their offerings to the gods consisted, not of animals, but of cakes of meal and grain steeped in honey, and other such bloodless sacrifices, and from flesh they abstained as though it were unholy to eat it or to stain with blood the altars of the gods; instead of that, those of us men who then existed lived what is called an Orphic life, keeping wholly to inanimate food and,