The Epistles of Cyprian

² He forbade one coming from any heresy to be baptized in the Church; that is, he judged the baptism of all heretics to be just and lawful. And although special heresies have special baptisms and different sins, he, holding communion with the baptism of all, gathered up the sins of all, heaped together into his own bosom. And he charged that nothing should be innovated except what had been handed down; as if he were an innovator, who, holding the unity, claims for the one Church one baptism; and not manifestly he who, forgetful of unity, adopts the lies and the contagions of a profane washing.

Let nothing be innovated, says he, nothing maintained, except what has been handed down. Whence is that tradition? Whether does it descend from the authority of the Lord and of the Gospel, or does it come from the commands and the epistles of the apostles? For that those things which are written must be done, God witnesses and admonishes, saying to Joshua the son of Nun: “The book of this law shall not depart out of your mouth; but you shall meditate in it day and night, that you may observe to do according to all that is written therein.” Also the Lord, sending His apostles, commands that the nations should be baptized, and taught to observe all things which He commanded.

If, therefore, it is either prescribed in the Gospel, or contained in the epistles or Acts of the Apostles, that those who come from any heresy should not be baptized, but only hands laid upon them to repentance, let this divine and holy tradition be observed. But if everywhere heretics are called nothing else than adversaries and antichrists, if they are pronounced to be people to be avoided, and to be perverted and condemned of their own selves, wherefore is it that they should not be thought worthy of being condemned by us, since it is evident from the apostolic testimony that they are of their own selves condemned?

So that no one ought to defame the apostles as if they had approved of the baptisms of heretics, or had communicated with them without the Church's baptism, when they, the apostles, wrote such things of the heretics. And this, too, while as yet the more terrible plagues of heresy had not broken forth; while Marcion of Pontus had not yet emerged from Pontus, whose master Cerdon came to Rome—while Hyginus was still bishop, who was the ninth bishop in that city—whom Marcion followed, and with greater impudence adding other enhancements to his crime, and more daringly set himself to blaspheme against God the Father, the Creator, and armed with sacrilegious arms the heretical madness that rebelled against the Church with greater wickedness and determination.