The Importance of Peace​​​​​​​
adapted from Chabad.org (https://www.chabad.org/parshah/article_cdo/aid/977794/jewish/The-Importance-of-Peace.htm)

(יז) כָּל מַחֲלֹקֶת שֶׁהִיא לְשֵׁם שָׁמַיִם, סוֹפָהּ לְהִתְקַיֵּם. וְשֶׁאֵינָהּ לְשֵׁם שָׁמַיִם, אֵין סוֹפָהּ לְהִתְקַיֵּם. אֵיזוֹ הִיא מַחֲלֹקֶת שֶׁהִיא לְשֵׁם שָׁמַיִם, זוֹ מַחֲלֹקֶת הִלֵּל וְשַׁמַּאי. וְשֶׁאֵינָהּ לְשֵׁם שָׁמַיִם, זוֹ מַחֲלֹקֶת קֹרַח וְכָל עֲדָתוֹ:

(17) Every dispute that is for the sake of Heaven, will in the end endure; But one that is not for the sake of Heaven, will not endure. Which is the controversy that is for the sake of Heaven? Such was the controversy of Hillel and Shammai. And which is the controversy that is not for the sake of Heaven? Such was the controversy of Korah and all his congregation.

(יב) אָמַר רַבִּי יְהוֹשֻׁעַ בֶּן לֵוִי, עָתִיד הַקָּדוֹשׁ בָּרוּךְ הוּא לְהַנְחִיל לְכָל צַדִּיק וְצַדִּיק שְׁלשׁ מֵאוֹת וַעֲשָׂרָה עוֹלָמוֹת, שֶׁנֶּאֱמַר (משלי ח), לְהַנְחִיל אֹהֲבַי יֵשׁ וְאֹצְרֹתֵיהֶם אֲמַלֵּא. אָמַר רַבִּי שִׁמְעוֹן בֶּן חֲלַפְתָּא, לֹא מָצָא הַקָּדוֹשׁ בָּרוּךְ הוּא כְּלִי מַחֲזִיק בְּרָכָה לְיִשְׂרָאֵל אֶלָּא הַשָּׁלוֹם, שֶׁנֶּאֱמַר (תהלים כט), ה' עֹז לְעַמּוֹ יִתֵּן ה' יְבָרֵךְ אֶת עַמּוֹ בַשָּׁלוֹם:

(12) Rabbi Yehoshua ben Levi said: In the world to come the Holy One, Blessed be He, will make each righteous person inherit three hundred and ten worlds, for it is written: "That I may cause those that love me to inherit yesh (numerical value of; and that I may fill their treasuries" (Proverbs 8:2. Rabbi Shimon ben Halafta said: the Holy One, Blessed be He, found no vessel that could contain blessing for Israel save that of peace, as it is written: "The Lord will give strength unto his people; the Lord will bless his people with peace."

סוטה

In the case of a woman who is a sotah (suspected adulteress), the process of—hopefully—clearing her of suspicion involves erasing the name of G‑d. Based on this, our sages say: “The power of peace is so great . . . that G‑d’s holy name, written in holiness, is erased in water in order to bring peace between the sotah and her husband.”

(יב) הִלֵּל וְשַׁמַּאי קִבְּלוּ מֵהֶם. הִלֵּל אוֹמֵר, הֱוֵי מִתַּלְמִידָיו שֶׁל אַהֲרֹן, אוֹהֵב שָׁלוֹם וְרוֹדֵף שָׁלוֹם, אוֹהֵב אֶת הַבְּרִיּוֹת וּמְקָרְבָן לַתּוֹרָה:

(12) Hillel and Shammai received [the oral tradition] from them. Hillel used to say: be of the disciples of Aaron, loving peace and pursuing peace, loving mankind and drawing them close to the Torah.

(א) אֵלּוּ דְבָרִים שֶׁאֵין לָהֶם שִׁעוּר. הַפֵּאָה, וְהַבִּכּוּרִים, וְהָרֵאָיוֹן, וּגְמִילוּת חֲסָדִים, וְתַלְמוּד תּוֹרָה. אֵלּוּ דְבָרִים שֶׁאָדָם אוֹכֵל פֵּרוֹתֵיהֶן בָּעוֹלָם הַזֶּה וְהַקֶּרֶן קַיֶּמֶת לוֹ לָעוֹלָם הַבָּא. כִּבּוּד אָב וָאֵם, וּגְמִילוּת חֲסָדִים, וַהֲבָאַת שָׁלוֹם בֵּין אָדָם לַחֲבֵרוֹ, וְתַלְמוּד תּוֹרָה כְּנֶגֶד כֻּלָּם:

(1) These are the things that have no definite quantity: The corners [of the field]. First-fruits; [The offerings brought] on appearing [at the Temple on the three pilgrimage festivals]. The performance of righteous deeds; And the study of the torah. The following are the things for which a man enjoys the fruits in this world while the principal remains for him in the world to come: Honoring one’s father and mother; The performance of righteous deeds; And the making of peace between a person and his friend; And the study of the torah is equal to them all.

סיפור עם הרבי

A story I heard firsthand:

A groom once presented his dilemma to the Rebbe: “I would like my father and father-in-law to escort me to the chupah (wedding canopy), and my mother and mother-in-law to escort my bride—as per Chabad custom. My future in-laws, however, insist that they walk their daughter to the chupah, and that my parents should walk me to the chupah—as is the popular custom amongst most other Orthodox circles. How should we resolve this issue?”

The Rebbe responded: “Since a Jewish minhag (custom) is Torah, you should try to keep your/our minhag. This is true, however, only if you can accomplish this in a peaceful manner. If, however, it will cause discord in the family, you should back down. Since the entire Torah was given only to bring peace to the world,as the verse say : ‘[The Torah’s] ways are pleasant ways, and all its paths are peace,’ it is not logical to allow a minhag to cause a dispute, thus countering the reason and purpose of the entire Torah!”

(יד) פּ֣וֹטֵֽר מַ֭יִם רֵאשִׁ֣ית מָד֑וֹן וְלִפְנֵ֥י הִ֝תְגַּלַּ֗ע הָרִ֥יב נְטֽוֹשׁ׃
(14) To start a quarrel is to open a sluice; Before a dispute flares up, drop it.

“Do not remain in a state of dispute with your friend for even one day. And (rather) humble yourself before him and be the first to ask for forgiveness.”

הקדמה

Ahithophel, King David’s wisest advisor, joined the side of Absalom son of David in his rebellion against his father. When Ahithophel realized that King David’s side would be victorious, he went home to give his children his last will and testament, and then committed suicide. One of the pieces of advice he gave them was: Do not get involved in disputes—this after he realized that his involvement in a dispute cost him his life.

ת"ר שלשה דברים צוה אחיתופל את בניו אל תהיו במחלוקת ואל תמרדו במלכות בית דוד ויום טוב של עצרת ברור זרעו חטים מר זוטרא אמר בלול איתמר אמרי נהרדעי משמיה דר' יעקב לא ברור ברור ממש ולא בלול בלול ממש אלא אפילו בלול ורוח צפונית מנשבתו זה הוא ברור
The Sages taught: Before his death, when he saw that Absalom’s rebellion against King David had failed, Ahithophel instructed his sons with regard to three matters: Do not be participants in a dispute. And do not rebel against the kingship of the house of David. And if the festival of Shavuot is a clear day, sow wheat, as it is a sign that the wheat crop will thrive. Mar Zutra said: It was stated that the wheat crop will thrive if Shavuot is a cloudy day, not if it is a clear day. The Sages of Neharde’a say in the name of Rabbi Ya’akov: According to both opinions, a clear day does not literally mean a clear day, nor does a cloudy day literally mean a cloudy day. Rather, even if the day is cloudy but a north wind is blowing the clouds away, this is considered a clear day.
אבל מקדש שני שהיו עוסקין בתורה ובמצות וגמילות חסדים מפני מה חרב מפני שהיתה בו שנאת חנם ללמדך ששקולה שנאת חנם כנגד שלש עבירות ע"ז גלוי עריות ושפיכות דמים
However, considering that the people during the Second Temple period were engaged in Torah study, observance of mitzvot, and acts of kindness, and that they did not perform the sinful acts that were performed in the First Temple, why was the Second Temple destroyed? It was destroyed due to the fact that there was wanton hatred during that period. This comes to teach you that the sin of wanton hatred is equivalent to the three severe transgressions: Idol worship, forbidden sexual relations and bloodshed.