De Pudicitia
De Pudicitia is a polemical treatise by Tertullian against the indulgent attitudes of Pope Callixtus I towards those who committed adultery and sexual immorality. It is notably the earliest Christian text which explicitly challenges the authority of the Bishop of Rome and possibly of Bishops in general, even as it aknowledges their Apostolic succession as valid.
Content
Tertullian attacks Callixtus I, the Bishop of Rome, whom he mockingly refers to as "Pontifex Maximus" and "bishop of bishops", for having issued an edict which allowed those who had committed adultery or sexual immorality to be readmitted in the Church after repentance. Tertullian decries the edict as a discouragement of sexual modesty, sarcastically claiming that it would be more fitting to read it aloud in brothels than in churches. Using the First [Epistle of John], he argues that there is a difference between sin which does not lead to death and mortal sin and that adultery falls under the latter. He further distinguishes between accepting pagans or heretics who had committed mortal sin before their conversion, which he claims is allowed, and readmitting baptized Christians who had done the same, which should not happen, since the latter should have known better. He clarifies that those who incur in mortal sin after baptism can be forgiven by God if they repent but should be barred from communion with the Church for their whole lives, in order to dissuade other believers from doing the same.In addition to the Epistle of John, he also approvingly references the Epistle to the Hebrews, which he attributes to Barnabas, while he rejects the canonicity of the Shepherd of Hermas, terming it "that apocryphal Shepherd of adulterers".
He notably rejects the claim that the power of "binding and loosing" granted to Peter the Apostle extends to the Apostolic Churches.