Are we commanded to love an Apikores as a fellow Jew, or are the regarded as something else?
My question is: does the Mitzva of Viahavta Lereiacha Kamocha apply to an Apikores?
Are we commanded to love an Apikores as a fellow Jew, or are the regarded as something else?
My question is: does the Mitzva of Viahavta Lereiacha Kamocha apply to an Apikores?
The minor tractate Avot D'Rabbi Natan (c.700–900 CE) records in chapter 16, commenting on the teaching of R. Yehoshua that hatred of creatures removes one from the world:
ושנאת הבריות כיצד? מלמד שלא יכווין אדם לומר אהוב את החכמים ושנא את התלמידים, אהוב את התלמידים ושנא את עמי הארץ, אלא אהוב את כולם, ושנא את האפיקורסין והמסיתים ומדיחין, וכן המסורות. וכן דוד אמר (תהלים קלט) "משנאיך ה' אשנא ובתקוממיך אתקוטט תכלית שנאה שנאתים לאויבים היו לי" הלא הוא אומר (ויקרא יט) "ואהבת לרעך כמוך אני ה'" מה טעם "כי אני בראתיו"? - ואם עושה מעשה עמך אתה אוהבו, ואם לאו אי אתה אוהבו.
"Hatred of creatures - How so? This teaches that one should not intend to say to love the wise men and hate the students, or love the students and hate the ignoramuses. But rather, one should intend to love them all, but hate the Apikorsim and those who entice to idolatry..."
The teaching here brings that very verse of ואהבת לרעך כמוך as a source text to prove that someone who is not considered a רעה is not privy to being treated as such. Thus, the Mitzvah does not apply to an Apikores, according to the Avot D'Rabbi Natan.
The Rambam himself (who mainly defined who is an apikores) addresses this question,
וכשנתקלקל לאדם יסוד מאלה היסודות הרי יצא מן הכלל וכפר בעיקר ונקרא צדוקי ואפיקורוס וקוצץ בנטיעות ומצוה לשונאו ועליו נאמר (תהלים קלט) הלא משנאך ה' אשנא
רמב"ם פירוש המשניות - מסכת סנהדרין פרק י משנה א
Actually it seems like its not only permitted to hate him, but it is mandatory, since he is god's enemy. The possible source for this Halacha is the Avos Dr Nathan cited in the previous answer.
This seems to be addressed Sefer Chafetz Chaim 8:5
(Source provided from Sefaria.org)
And this entire issur of lashon hara applies only [when spoken] against the man who is in the category of "your neighbor" [amitecha], "am she'techa", i.e. "a people who is with you" in Torah and in mitzvoth. But those people whom he knows to have "apikorsoth" [heresy] among them, it is a mitzvah to demean and to shame, both in their presence and not in their presence, in everything that he sees or hears about them. For it is written (Vayikra 25:17): "And you shall not wrong, one man, his fellow [amito]" and (Vayikra 19:16): "You shall not go talebearing among your people [be'amecha]." And they are not in this category, for they do not act as Your people. And it is written (Tehillim 139:21): "Do I not hate your haters, O L-rd? And against those who rise up against You do I strive." And one who denies the Torah and prophecy of Israel, both the written and the oral Law, is called an apikoress [heretic], even if he says all the Torah is from Heaven, except for one verse, or one kal vachomer [a fortiori argument], or one gezeirah shavah [identity deduction], or one dikduk [inference].
Hope this helps.