Don't argue with heretics (1)

 1st Timothy 6 

1. Let as many servants as are under the yoke count their own masters worthy of all honor, that the name of God and his doctrine be not blasphemed.

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2And they that have believing masters, let them not despise them, because they are brethren; but rather do them service, because they are believers and beloved, partakers of the benefit. These things teach and exhort.

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3If any man teach otherwise, and consent not to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which is according to godliness;

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4He is proud, knowing nothing, but doting over questions and disputes of words, out of which comes envy, strife, railings, evil suspicions,

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5Perverse wranglings of men of corrupt minds, and destitute of the truth, supposing that gain is godliness: from such withdraw yourself.

Prescription against heretics - Catholic Encyclopedia

https://www.newadvent.org/fathers/0311.htm

Chapter 16. Apostolic Sanction to This Exclusion of Heretics from the Use of the Scriptures. Heretics, According to the Apostle, are Not to Be Disputed With, But to Be Admonished.

I might be thought to have laid down this position to remedy distrust in my case, or from a desire of entering on the contest in some other way, were there not reasons on my side, especially this, that our faith owes deference to the apostle, who forbids us to enter on questions, or to lend our ears to new-fangled statements, 1 Timothy 6:3-4 or to consort with a heretic after the first and second admonition, Titus 3:10 not, (be it observed,) after discussion. Discussion he has inhibited in this way, by designating admonition as the purpose of dealing with a heretic, and the first one too, because he is not a Christian; in order that he might not, after the manner of a Christian, seem to require correction again and again, and before two or three witnesses, Matthew 18:16 seeing that he ought to be corrected, for the very reason that he is not to be disputed with; and in the next place, because a controversy over the Scriptures can, clearly, produce no other effect than help to upset either the stomach or the brain.

John Chrysostom

AD 407

Perverse disputings, that is, leisure or conversation, 

or he may mean intercommunication, and that as 

infected sheep by contact communicate disease to 

the sound, so do these bad men. Destitute of the 

truth, thinking that gain is godliness. Observe what 

evils are produced by strifes of words. The love of 

gain, ignorance, and pride; for pride is engendered 

by ignorance. From such withdraw yourself. He 

does not say, engage and contend with them, but 

withdraw yourself, turn away from them; as 

elsewhere he says, A man that is an heretic after the 

first and second admonition reject. Titus 3:10 He 

shows that they do not so much err from ignorance, 

as they owe their ignorance to their indolence. 

Those who are contentious for the sake of money 

you will never persuade. They are only to be 

persuaded, so long as you give, and even so you will

 never satisfy their desires. For it is said, The 

covetous man's eye is not satisfied with a portion. 

Sirach 14:9 From such then, as being incorrigible, it

 is right to turn away. And if he who had much 

obligation to fight for the truth, is advised not to 

engage in contention with such men, much more 

should we avoid it, who are in the situation of 

disciples.