1 John 5:16

Shepherd of Hermas Similitude Sixth

These have been perverted from the truth: among them there is the hope of repentance, by which it is possible to live. Corruption, then, has a hope of a kind of renewal,[7]

Clement of Alexandria Stromata Book II

For"there is a sin unto death: I do not say that one is to pray for it. All unrighteousness is sin; and there is a sin not unto death."[152]

Tertullian On Modesty

but John, too, will teach us: "If any knoweth his brother to be sinning a sin not unto death, he shall request, and life shall be given to him; "because he is not "sinning unto death," this will be remissible. "(There) is a sin unto death; not for this do I say that any is to request"[46]

Tertullian On Modesty

For (in making these assertions) he was looking forward to the final clause of his letter, and for that (final clause) he was laying his preliminary bases; intending to say, in the end, more manifestly: "If any knoweth his brother to be sinning a sin not unto death, he shall make request, and the Lord shall give life to him who sinneth not unto death. For there is a sin unto death: not concerning that do I say that one should make request."[252]

Hippolytus Refutation of All Heresies Book IX

unto death,[54]

Cyprian Treatise XII Three Books of Testimonies Against the Jews

Of this same thing in the first book of Kings: "If a man sin by offending against a man, they shall pray the Lord for him; but if a man sin against God, who shall pray for him? "[557]

Origen Commentary on Matthew Book XIII

at such words are spoken about every sin, whether the sin be murder, or poisoning, or paederasty, or anything of that sort, would give occasion of injury to the exceeding goodness of Christ, so, on the contrary, he who distinguishes between the brother and him who is called the brother, might teach that, in the case of the least of the sins of men, he who has not repented after the telling of the fault is to be reckoned as a Gentile and a publican, for sins which are "not unto death,"[193]