Olam Habah

Besides Chillul Hashem, what r the avairos that can cause a person to loose Olam Habah?

Shalom!

Thank you for your question.

Let’s take a look at a Mishna:

“All of the Jewish people have a share in the World-to-Come, as it is stated: “And your people also shall be all righteous, they shall inherit the land forever; the branch of My planting, the work of My hands, for My name to be glorified” (Isaiah 60:21). And these are the exceptions of people who have no share in the World-to-Come: One who says: There is no resurrection of the dead derived from the Torah, and one who says: The Torah did not originate from Heaven, and an Apikoros.

We see that there are three primary sins that can prevent person from having a share in the World to Come. While the first two are obvious, the third, “an Apikoros” is not.

The term “Apikoros” is said to be a reference to the Greek philosopher Epicurus. Epicurus was a pagan philosopher whose views contradicted Jewish law. The Rambam specifies that it is a person who denies that God communicates with humans through prophecy and one who denies the prophecy of Moses, among other things.

Others suggest that “Apikoros” might be referring to certain severe sins. Take for example the teaching: Rav and Rabbi Ḥanina both say: An Apikoros is one who treats a Torah scholar with contempt. Rabbi Yoḥanan and Rabbi Yehoshua ben Levi say: This is one who treats another with contempt before a Torah scholar.

Nevertheless, in Judaism, there is no such thing as G-d being angry forever. We believe that all mankind who has sinned can be cleansed of their sin with prayer and “Teshuva”, meaning, repentance.

We see this, in fact, in the very first chapters of the Torah, where it says that G-d said to Cain: "Why are you upset, and why has your countenance fallen? If you do good [i.e. repent and change your ways], it will be goo for you [that is, you will be forgiven]. But if you don’t do good, sin rests at the door..but you can overcome it!" (Genesis 4:6-7).

Anyone who confesses and regrets their sins and commits not to do such things again will be forgiven this is called Repentance and one should consult an orthodox Rabbi with how to make amends.

Tractate Sanhedrin, Chapter 10.