Webster's New Collegiate Dictionary:
"heresy ... an opinion or doctrine contrary to the truth."

Webster's New World College Dictionary:
"heretic ... a person who professes a heresy."

Acts 24:10 Then Paul, after that the governor had beckoned unto him to speak, answered, Forasmuch as I know that thou hast been of many years a judge unto this nation, I do the more cheerfully answer for myself:
11 Because that thou mayest understand, that there are yet but twelve days since I went up to Jerusalem for to worship.
12 And they neither found me in the temple disputing with any man, neither raising up the people, neither in the synagogues, nor in the city:
13 Neither can they prove the things whereof they now accuse me.
14 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:
15 And have hope toward God, which they themselves also allow, that there shall be a resurrection of the dead, both of the just and unjust.

1 Corinthians 11:17 Now in this that I declare unto you I praise you not, that ye come together not for the better, but for the worse.
18 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 among you, that they which are approved may be made manifest among you.

Galatians 5:19 Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
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.

Titus 3:10 A man that is an heretick after the first and second admonition reject;
11 Knowing that he that is such is subverted, and sinneth [NKJV: such a person is warped and sinning], being condemned of himself.

2 Peter 2:1 But there were false prophets also among the people, even as there shall be false teachers among you, who privily [NKJV: secretly] shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
2 And many shall follow their pernicious ways; by reason of whom the way of truth shall be evil spoken of.

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