Ignatius of Antioch, Epistle to the Philadelphians 5.2

So then, children of the light of truth, flee from division and from evil teachings. Where the shepherd is, there follow as sheep.

For many wolves, seemingly trustworthy, take captive the runners for God with evil pleasure; but in your unity they will have no place.

Greek

Τέκνα οὖν φωτὸς ἀληθείας, φεύγετε τὸν μερισμὸν καὶ τὰς κακοδιδασκαλίας: ὅπου δὲ ὁ ποιμήν ἐστιν, ἐκεῖ ὡς πρόβατα ἀκολουθεῖτε.

πολλοὶ γὰρ λύκοι ἀξιόπιστοι ἡδονῇ κακῇ αἰχμαλωτίζουσιν τοὺς θεοδρόμους: ἀλλ’ ἐν τῇ ἑνότητι ὑμῶν οὐχ ἕξουσιν τόπον.