Iohannes Philoponus, Commentary on Aristotle De Anima 186.24 Hayduck = Orph. 421.II Bernabé
λεγομένοις εἶπεν, ἐπειδὴ μὴ δοκεῖ Ὀρφέως εἶναι τὰ ἔπη, ὡς καὶ αὐτὸς Arist. fr. 7 Rose ἐν τοῖς Περὶ φιλοσοφίας λέγει· αὐτοῦ μὲν γάρ εἰσι τὰ δόγματα, ταῦτα δέ φασιν Ὀνομάκριτον ἐν ἔπεσι κατατεῖναι.
He says ‘in the so-called poems’, since the poems do not seem to be by Orpheus, as Aristotle himself says in On Philosophy. For the doctrines are his (Orpheus’) but they say that Onomacritus put them into verse.