5 Bible Verses about Heresy

I know your doings, your hard work and your patient endurance; I know that you cannot bear wicked men, and that you have tested those who style themselves apostles (no apostles they!) and detected them to be liars;

Having learned that some of our number, quite unauthorized by us, have unsettled you with their teaching and upset your souls,

It simply means that certain individuals are unsettling you; they want to distort the gospel of Christ.

You put up with it all right, when some interloper preaches a second Jesus (not the Jesus I preached), or when you are treated to a Spirit different from the Spirit you once received, and to a different gospel from what I gave you! Why not put up with me?

There were traitors of false brothers, who had crept in to spy out the freedom we enjoy in Christ Jesus; they did aim at enslaving us again.

After a first and a second warning have no more to do with a factious person; you may be sure a man like that is perverted; he is sinning and he knows it.

If anyone comes to you and does not bring this doctrine, do not admit him to the house ??do not even greet him, for he who greets him shares in his wicked work.

Bringing them before the praetors they declared, "These fellows are Jews who are making an agitation in our town; they are proclaiming customs which as Romans we are not allowed to accept or observe!"

had many lashes inflicted on them and put them into prison, charging the jailer to keep them safe.

they cannot furnish you with any proof of their present charges against me. I certainly admit to you that I worship our fathers' God according to the methods of what they call a 'sect'; but I believe all that is written in the Law and in the prophets, and I cherish the same hope in God as they accept, namely that there is to be a resurrection of the just and the unjust. read more.
Hence I too endeavour to have a clear conscience before God and men all the time.

crying, "This fellow incites men to worship God contrary to the Law."