Matthew 7:15

Epistle of Ignatius to the Ephesians

are offered, and with "the Church of the first-born whose names are written in heaven," is a wolf in sheep's clothing,[40]

Epistle of Ignatius to the Philadelphians

But where the shepherd is, there do ye as sheep follow. For there are many wolves in sheep's clothing,[11]

Epistle of Ignatius to Hero, a Deacon of Antioch

Every one that teaches anything beyond what is commanded, though he be [deemed] worthy of credit, though he be in the habit of fasting, though he live in continence, though he work miracles, though he have the gift of prophecy, let him be in thy sight as a wolf in sheep's clothing,[12]

Dialogue of Justin

For he said, `Many shall come in My name, clothed outwardly in sheep's clothing, but inwardly they are ravening wolves.'"[88]

Dialogue of Justin

And, `Beware of false prophets, who shall come to you clothed outwardly in sheep's clothing, but inwardly they are ravening wolves.'[90]

Tertullian The Prescription Against Heretics

neither ought their existence to surprise us, for it was foretold that they should come to pass;[3]

Tertullian The Prescription Against Heretics

But let us rather be mindful of the sayings of the Lord, and of the letters of the apostles; for they have both told us beforehand that there shall be heresies, and have given us, in anticipation, warnings to avoid them; and inasmuch as we are not alarmed because they exist, so we ought not to wonder that they are capable of doing that, on account of which they must be shunned. The Lord teaches us that many "ravening wolves shall come in sheep's clothing."[34]

Archelaus Acts of the Disputation with the Heresiarch Manes

, however, held back, because he did not find a suitable reply; for he was pondering the conclusion which might be drawn from either of two answers which he might make, tutoring the matter over thus in his thoughts: If I say that they are converted, he will meet me with that statement which is recorded in the Gospel about the trees;[134]

Archelaus Acts of the Disputation with the Heresiarch Manes

lest perchance, after we had traversed lengthened courses of our own, we should find our day prematurely closing upon us in night, and lest, while outwardly indeed we might appear splendid to men's view, we should inwardly he comparable only to ravening wolves,[481]

Lactantius Divine Institutes Book V

But it is the same blindness, to give the name of falsehood to truth, and of truth to falsehood. Doubtless the crafty man wished to conceal the wolf under the skin of a sheep,[38]

Constitutions of the Holy Apostles Book VI

Ye shall know them by their fruits; take care of them. For false Christs and false prophets shall arise and shall deceive many."[69]