The Epistle of Ignatius to the Philadelphians
" Keep yourselves from those evil plants which Jesus Christ does not tend, because they are not
the planting of the Father. Not that I have found any division among you, but exceeding purity. For as many as are of God and of Jesus Christ are also with the bishop. And as many as shall, in the exercise of repentance, (those that sacrifice to idols) return into the unity of the Church, these, too, shall belong to God, that they may live according to Jesus Christ. Do not err, my brethren. If any man follows him that makes a schism . Take heed, then, to have but one Eucharist. For there is one flesh of our Lord Jesus Christ, and one cup to [show forth] the unity of His blood; one altar; as there is one bishop, along with the presbytery and deacons, my fellow-servants: that so, whatsoever you do, you may do it according to [the will of] God. in the Church, he shall not inherit the kingdom of God. If any one walks according to a strange opinion, he agrees not with the passion [of Christ.]... For though some would have deceived me according to the flesh, yet the Spirit, as being from God, is not deceived. For it knows both whence it comes and whither it goes, John 3:8 and detects the secrets [of the heart]. For, when I was among you, I cried, I spoke with a loud voice: Give heed to the bishop, and to the presbytery and deacons. Now, some suspected me of having spoken thus, as knowing beforehand the division caused by some among you. But He is my witness, for whose sake I am in bonds, that I got no intelligence from any man. But the Spirit proclaimed these words: Do nothing without the bishop; keep your bodies as the temples of God; love unity; avoid divisions; be the followers of Jesus Christ, even as He is of His Father."