Ignatius of Antioch, Epistle to the Trallians 3.6
So I urge you, not I myself but the love of Jesus Christ: take only Christian food, and keep away from any foreign plant, which is false teaching.
These people weave Jesus Christ into themselves while claiming to be worthy of trust, like those who give a deadly poison mixed with honeyed wine. The one who does not know takes it gladly, with evil pleasure, and so receives death.
Greek
Παρακαλῶ οὖν ὑμᾶς, οὐκ ἐγώ, ἀλλ’ ἡ ἀγάπη Ἰησοῦ Χριστοῦ: μόνῃ τῇ χριστιανῇ τροφῇ χρῆσθε, ἀλλοτρίας δὲ βοτάνης ἀπέχεσθε, ἥτις ἐστὶν αἵρεσις:
οἳ ἑαυτοῖς παρεμπλέκουσιν Ἰησοῦν Χριστὸν καταξιοπιστευόμενοι, ὥσπερ θανάσιμον φάρμακον διδόντες μετὰ οἰνομέλιτος, ὅπερ ὁ ἀγνοῶν ἡδέως λαμβάνει ἐν ἡδονῇ κακῇ τὸ ἀποθανεῖν.