What are the implicatons of the double Lashon "Shabbas Shabbason"?
Refer to Sh'mos, 31:15:2:1-4.
Oznayim la'Torah (citing Pirkei de'R. Eliezer): 'Were it not for Yom Kipur, the world would not exist, since, based on the double Lashjon "Shabbas Shabbason", Yom Kipur atones both in this world and in the world to come - "Shabbos" in this world, "Shabbason" in the world to come. 1
Oznayim la'Torah: Consequently, even if all the Yamim-Tovim are negated, Yom Kipur will remain intact.
Why does the Torah here write "Shabbbas Shabbason Hi ... ", when, in Acharei-Mos, 16:31, it wrote "Hu"?
Rashi (in Yoma, 81b): "The Pasuk in Acharei-Mos is referring to the Menuchah of Shabbos.
Oznayim la'Torah: Because, whereas here, it is referring to the day, in Acharei-Mos it is referring to "Eis" (which is feminine) in Pasuk 2.
Seeing as Yom Kipur is on the tenth, why does the Torah write "be'Tish'ah la'Chodesh"?
Targum Yonasan and Rosh Hashanah 9a: To teach us that one must begin the fast before nightfall. 1
B'rachos, 8b: To teach us that whoever eats and drinks on the ninth of Tishri, it is considered as if he had fasted on the ninth and the tenth. 2
Why does the Torah add the (otherwise superfluos) words "Tishb'su Shabbatchem"?
Targum Yonasan and Rosh Hashanah, 9a): To teach us that one should begin Shabbas and every Yom-Tov 1 before nightfall 2 , (and that one should celebrate all the Mo'adim with joy - Targum Yonasan).
The Gemara in Rosh Hshanah, 9a learns Tosefes Shabbos from "Tishb'su" and Tosefes Yom-Tov from "Sabbatchem" (See Torah Temimah, note 100) - and concludes that wherever the Torah uses a Lashon of 'Sh'vos' a Tosefes is required - to include Sh'mitah (See Torah Temimah, note 101).
See Peirush Yonasan and Nos'ei K'lei Yonasan.
In order to resolve "be'Sish'ah la'Chodesh", the Gemara in Rosh Hashanah 9a concludes that one must begin the fast before nightfall. Why is this different than " ba'Erev Tochlu Matzos" (in Bo Sh'mos, 12:18) with reference to the fourteenth of Nisan), which means 'at nighttime?
Moshav Zekenim (on Pasuk 27) #1: There, the Mitzvah to eat Matzah is written after "ba'Erev". Here, Inuy is written before "be'Sish'ah", which implies that it applies during the day.
Moshav Zekenim (on Pasuk 27) #2: Here is different, for it says "[Ve'inisem be'Sish'ah la'Chodesh] ba'Erev me'Erev ad Erev [Tishb'su]" The Pasuk implies that we fast on the ninth, and at night we cease Melachah.
