What commandments, including any minhagim and the like, are Non-Jews ABSOLUTELY forbidden from keeping (in its entirety)?
A famous one is the prohibition of keeping Shabbat, EVEN for a a Non-Jew that is in the process of conversion (in its entirety).
Besides Shabbat, are there any other commandments that are forbidden for Non-Jews, under the assumptions:
- They are well learned in the laws regarding said mitzvah
- They do it for their own (the mitzvah’s) sake, whether during conversion process, mitzvah is logically appealing, etc.
Regarding the above, what would be the difference? (if any):
- They live alone
- They live with Non-Jews
- They live with Jews