Ignatius of Antioch, Epistle to the Smyrnaeans 6.8
All of you follow the bishop, as Jesus Christ followed the Father, and follow the council of elders as you would the apostles. Respect the deacons as God's command. Let no one do anything that pertains to the church without the bishop. Let that Eucharist be considered valid which is under the bishop or under someone he has entrusted.
Wherever the bishop appears, there let the congregation be, just as wherever Jesus Christ is, there is the whole church. It is not permitted to baptize or to hold a love-feast without the bishop. But whatever he approves, this is also pleasing to God, so that everything you do may be secure and valid.
Greek
Πάντες τῷ ἐπισκόπῳ ἀκολουθεῖτε, ὡς Ἰησοῦς Χριστὸς τῷ πατρί, καὶ τῷ πρεσβυτερίῳ ὡς τοῖς ἀποστόλοις. τοὺς δὲ διακόνους ἐντρέπεσθε ὡς θεοῦ ἐντολήν. μηδεὶς χωρὶς τοῦ ἐπισκόπου τι πρασσέτω τῶν ἀνηκόντων εἰς τὴν ἐκκλησίαν. ἐκείνη βεβαία εὐχαριστία ἡγείσθω, ἡ ὑπὸ ἐπίσκοπον οὖσα ἢ ᾧ ἄν αὐτὸς ἐπιτρέψῃ.
ὅπου ἂν φανῇ ὁ ἐπίσκοπος, ἐκεῖ τὸ πλῆθος ἤτω, ὥσπερ ὅπου ἂν ᾖ Ἰησοῦς Χριστός, ἐκεῖ ἡ καθολικὴ ἐκκλησία. οὐκ ἐξόν ἐστιν χωρὶς τοῦ ἐπισκόπου οὔτε βαπτίζειν οὔτε ἀγάπην ποιεῖν: ἀλλ’ ὃ ἂν ἐκεῖνος δοκιμάσῃ, τοῦτο καὶ τῷ θεῷ εὐάρεστον, ἵνα ἀσφαλὲς ᾖ καὶ βέβαιον πᾶν ὃ πράσσετε.