Eusebius Book 7, Section 29

7.29.1

XXIX. καθ’ ὃν τελευταίας συγκροτηθείσης πλείστων ὅσων ἐπισκόπων συνόδου, καὶ πρὸς ἁπάντων ἤδη σαφῶς καταγνωσθεὶς ἑτεροδοξίαν ὁ τῆς κατὰ Ἀντιόχειαν αἱρέσεως ἀρχηγὸς τῆς ὑπὸ τὸν οὐρανὸν καθολικῆς ἐκκλησίας ἀποκηρύττεται. μάλιστα δ’ αὐτὸν εὐθύνας ἐπικρυπτόμενον διήλεγξεν Μαλχίων, ἀνὴρ τά τε ἄλλα λόγιος καὶ σοφιστοῦ τῶν ἐπ’ Ἀντιοχείας παιδευτηρίων διατριβῆς προεστώς, οὐ μὴν ἀλλὰ καὶ δι’ ὑπερβάλλουσαν τῆς εἰς χριστὸν πίστεως γνησιότητα πρεσβυτερίου τῆς αὐτόθι παροικίας ἠξιωμένος· οὗτός γέ τοι ἐπισημειουμένων ταχυγράφων ζήτησιν πρὸς αὐτὸν ἐνστησάμενος , ἢν καὶ εἰς δεῦρο φερομένην ἴομεν, μόνος ἴσχυσεν τῶν ἄλλων κρυψίνουν ὄντα καὶ ἀπατηλὸν φωρᾶσαι τὸν ἄνθρωπον.

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XXIX. In Aurelian's day a final synod of an exceedingly large number of bishops was assembled, and the leader of the heresy at Antioch, being unmasked and now clearly condemned of heterodoxy by all, was excommunicated from the Catholic Church under heaven. The person foremost in calling him to account and in utterly refuting his attempts at concealment was Malchion, a learned man, who also was head of a school of rhetoric, one of the Greek educational establishments at Antioch; and, moreover, for the surpassing sincerity of his faith in Christ he had been deemed worthy of the presbyterate of that community. In fact, this man had stenographers to take notes as he held a disputation with Paul, which we know to be extant even to this day; and he, alone of them all, was able to unmask that crafty and deceitful person.