Lizchus Chana Leiba bas Necha Gittel, for Bracha and Hatzlacha.
ויהיו חיי שרה מאה שנה ועשרים שנה ושבע שנים
- The Medrash cites the pasuk יודע ה' ימי תמימים ונחלתם לעולם תהיה - "Hashem knows the days of the complete and their inheritance will be forever" and relates it to Sarah. And it says that just as the Tzadikim are complete so are their years [based on the fact that the pasuk mentions both Sarah and her years] . "ונחלתם לעולם תהיה" can be interpreted to mean that the portion of complete people is forever.
There are two central themes in the Parsha. The burial of Sarah in Eretz Yisrael and the story of the shidduch of Yitzchak. These are alluded to in the pasuk that talks about complete years and an eternal inheritance. Sarah's years were complete, her inheritance of Me'aras Hamechpeila was forever and Yitzchak certainly was a complete person whose years were complete [and his spiritual inheritance is forever].
The statement of Sarah that "כי לא יירש בן האמה הזאת עם בני עם יצחק" - B/c the son of the maidservant will not inherit with my son with Yitzchak, received the Bracha of Moshe "וישכון ישראל בטח בדד עין יעקב" - The Jewish people dwelt in security alone, the spring of Yaakov. The promise of security is only when the Jews are alone. This segulah is an inheritance of the inheritance of Yaakov from the fountain of Yaakov.
"קדש ישראל לה' ראשית תבואתה" - Israel is holiness to Hashem, the first fruits of his produce. From this prophecy of Yirmiyahu it emerges that there are two aspects to the Kedusha of the Jewish people. תרומה and קודש. When it comes to תרומה, the ראשית תבואה, there is a rule that one must leave over some for himself. If he made his entire storehouse into תרומה it is no good!! "שייריה ניכרים". Whereas when it comes to קודש, a person can sanctify ALL of his possessions to the Beis Hamikdash. A Jew has the power to create Hekdesh. The Zohar Hakadosh says that we all must sanctify ourselves like the Avos "לקדשא כל חד גרמיה" [Zohar 3/93]. That is the קודשה of the Jewish people which is the קדושה of the Avos.
The pasuk says "כה אמר ה' אל בית יעקב אשר פדה אברהם" - So said Hashem to the House of Yaakov who redeemed Avraham. The Gemara expounds [Sanhedrin 19b] that Yaakov Avinu redeemed Avraham Avinu. Yishmael and the sons of Keturah came from Avraham and Esav came from Yitzchak while the bed of Yaakov was complete. All of his children were complete Jews which was the redemption of Avraham. Avraham and Yitzchak were תרומה where some of their seed was holy and chosen while the rest remained mundane. Yaakov in contrast is קודש to Hashem where it is all holy. קודש גרמיה as the Zohar Hakadosh says. 'קדש ישראל לה which leaves no room for the Gentile nations. ראשית תבואתה symbolizes the relationship between the Jews and Gentiles, for as the Navi said "והלכו גויים לאורך ומלכים לנוגה זרחך" - The Gentiles are going to walk in the Light of the Jewish people. Like תרומה. A symbiotic relationship between what is holy and what is less holy.
"בהנחל עליון גויים בהפרידו בני אדם יצב גבולות עמים למספר בני ישראל". - When the Most High gave to the nations their inheritance, when He separated the children of men, He set the bounds of the peoples according to the number of the children of Israel. The concept of מספר - number, has no limit. One can count and count and count to no end. This "concept" of infinity relates to the Jewish people. למספר בני ישראל. [The simple meaning of the pasuk is that the Jews were 70 when descending to Egypt, so too the Gentiles are split up into 70 nations]. The Jewish people are infinite with infinite קדושה. As we learned - 'קדש ישראל לה. The nations have no connection to this realm. Then there is the limited קדושה, that of תרומה, where שייריה ניכרים, some holy some not. The fact that this is a limited קדושה, one where there are unsanctified remnants, allows the nations of the world to connect and have a portion.
The recognition of the nations in the future is dependent on Yaakov. On the vision of Yehsayahu וְֽהָלְכ֞וּ עַמִּ֣ים רַבִּ֗ים וְאָֽמְרוּ֙ לְכ֣וּ ׀ וְנַעֲלֶ֣ה אֶל־הַר־יְהֹוָ֗ה אֶל־בֵּית֙ אֱלֹהֵ֣י יַעֲקֹ֔ב - And many peoples shall go and say, "Come, and let us go up to the mountain of Hashem, to the house of the God of Yaacov" Chazal expound "Not like Avraham who called it a mountain, not like Yitzchak who called it a field but like Yaakov who called it a HOUSE" [Pesachim 88a]. As Yaakov says "אין זה כי אם בית א-להים" - This is only a HOUSE of Hashem. Mountains and fields are open spaces. Avraham was open and spread the Word of Hashem to the world. His life's work was publicizing knowledge of Hashem. Yitzchak was מקדש שם שמים to the world. While Yaakov did something different. He created boundaries. Like a house. 12 defined tribes. The קדושה of the Jewish people can only be assured when we are alone. "וישב ישראל בטח בדד". Secure when alone.