Epistle to Diognetus

But again their scruples concerning meats, and their superstition relating to the Sabbath and the vanity of their circumcision and the dissimulation of their fasting and new moons, I do [not] suppose you need to learn from me, are ridiculous and unworthy of any consideration.

Ἀλλὰ μὴν τό γε περὶ τὰς βρώσεις αὐτῶν ψοφοδεὲς καὶ τὴν περὶ τὰ σάββατα δεισιδαιμονίαν καὶ τὴν τῆς περιτομῆς ἀλαζονείαν καὶ τὴν τῆς νηστείας καὶ νουμηνίας εἰρωνείαν, καταγέλαστα καὶ οὐδενὸς ἄξια λόγου, οὐ νομίζω σε χρῄζειν παῤ ἐμοῦ μαθεῖν.

For of the things created by God for the use of man to receive some as created well, but to decline others as useless and superfluous, is not this impious?