3

The חידושי הריטב"א (succah 6b) explains that the Rabbis (Chachomim) assert that a kazayis is the minimum size that is fitting for eating so that became the standard for most eating related measurements (Yom Kippur being an exception) but it's still too small of a size to be significant with regard to carrying on shabbat whereas a fig גרוגרת is the ...


2

Building on what Double AA and Joel K have said: מדאורייתא this is definitely permitted. The decree of King Solomon declared multiple contiguous רשויות היחיד in which people live in defined, separate areas as "separated" in a sense, and said that they they need to be "combined" in order to allow carrying between them. However there are ...


2

According to Torah law that is indeed permissible since it's not one of the two forbidden categories of transferring you mentioned. However, King Solomon enacted that it be forbidden to do so unless the neighbors first enact an Eruv between them, symbolically joining their distinct private domains into one, lest people get confused and come to transfer ...


1

It's a הלכה למשה מסיני brought in sukkah 6a. Sefaria's version: תאנה כגרוגרת להוצאת שבת Fig alludes to the measure of a dried fig-bulk with regard to the halakhot of carrying out on Shabbat. One is liable for carrying food fit for human consumption on Shabbat, provided that he carries a dried fig-bulk of that food ....... אלמא דאורייתא נינהו ותסברא שיעורין ...


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