[Avodah] The 7 mitzvos of Bnei Noach

[Marty Bluke]

Daf Yomi recently learned the sugya and I was left with a number of
fundamental questions.
1. What is the mechayev for Bnei Noach to keep the 7 mitzvos? We have matan
Torah where we accepted the Torah. Where is the equivalent by the Bnei
Noach?
2. How are they supposed to know what to do? The Gemara has a fundamental
dispute as to what are the 7 mitzvos. One Tanna takes out cursing hashem
and eiver min hachai and replaces it with kilayim and sirus.  All the
tannaim learn them out from pesukim in bereishis.  How are the Bnei Noach
supposed to know that annd who is right? Also, how were the people from
creation until bereishis was written supposed to know what the 7 mitzvis
are? The Gemara also has a dispute as to which arayos are prohibited for
Bnei Noach based on derashos. How are the Bnei Noach supposed to figure
that out?

I saw a fascinating Chizkuni who addressed these questions in a way. The
chizkuni (Bereishis 7:21) asked how could hashem punish the dor hamabul
when they weren’t chayav in anything? He answered that gezel is a mitzvah
that they should have known without any chiyuv. The obvious question on the
chizkuni is when did they become chayav in the 7 mitzvos especially things
like eiver min hachai which are not something you could figure out?
The Mishne Lamekech (melachim 10:8 at the very end) quotes a question from
the yefe toar. How could Rav Yitzchak say that the Torah shoujd have
started from hachodesh hazeh, if so we wouldn’t know what the 7 mitzvos
are? He answers that Torah is just for the Jewish people and not for the
non Jews. But it begs the question, so how do the non Jews know what the 7
mitzvos are?
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