Preserve, brothers, the faithful apostolic deposit entrusted to you.
“Θαυμάζω ὅτι οὕτως ταχέως μετατίθεσθε ἀπὸ τοῦ καλέσαντος ὑμᾶς ἐν χάριτι Χριστοῦ εἰς ἕτερον εὐαγγέλιον, ὃ οὐκ ἔστιν ἄλλο· εἰ μή τινές εἰσιν οἱ ταράσσοντες ὑμᾶς καὶ θέλοντες μεταστρέψαι τὸ εὐαγγέλιον τοῦ Χριστοῦ. ἀλλὰ καὶ ἐὰν ἡμεῖς ἢ ἄγγελος ἐξ οὐρανοῦ εὐαγγελίζηται ὑμῖν παρ’ ὃ εὐηγγελισάμεθα ὑμῖν, ἀνάθεμα ἔστω. ὡς προειρήκαμεν, καὶ ἄρτι πάλιν λέγω, εἴ τις ὑμᾶς εὐαγγελίζεται παρ’ ὃ παρελάβετε, ἀνάθεμα ἔστω.”
“I am astonished that you are so quickly deserting him who called you in the grace of Christ and are turning to a different gospel—not that there is another one, but there are some who trouble you and want to distort the gospel of Christ. But even if we or an angel from heaven should preach to you a gospel contrary to the one we preached to you, let him be accursed. As we have said before, so now I say again: If anyone is preaching to you a gospel contrary to the one you received, let him be accursed.” (Gal. 1:6-9)