1 Corinthians 11:18-19 KJV
For first of all, when ye come together in the church, I hear that there be divisions among you; and I partly believe it. [19] For there must be also heresies h among you, that they which are approved may be made i manifest among you.
Galatians 5:19-21 KJV
Now the works of the flesh are manifest, i which are these; Adultery, fornication, uncleanness, lasciviousness, j [20] Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, [21] Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
2 Peter 2:1 KJV
But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
Acts 24:14 KJV
But this I confess unto thee, that after the way which they call heresy, so worship I the God of my fathers, believing all things which are written in the law and in the prophets:
Titus 3:9-11 KJV
But avoid foolish questions, and genealogies, and contentions, and strivings about the law; for they are unprofitable and vain. [10] A man that is an heretick after the first and second admonition reject; [11] Knowing that he that is such is subverted, and sinneth, being condemned of himself.
These are the verses that I know of in the Bible that use the term heretic. I noted three with bold print. The first and second come close to something of a definition. It involves divisions in the first one, but denying the Lord in the second.
The Acts reference is interesting... Paul seems not to mind the charge of being a heretic, but claims he isn't. In other words, he is saying, "they call me a heretic, but I am the one following the bible!"
I have been called a heretic because of my stance on a certain subject was "not orthodox". I don't mind that one bit, and it seems Paul didn't either.
I had an interesting exchange with #Breadoflife once on this topic. He explained to me that people who are of the Protestant denominations from birth are not heretics; but former Catholics who become such are heretics. If I am mistaken, my apologies.
I'll continue later...