(כ) צֶ֥דֶק צֶ֖דֶק תִּרְדֹּ֑ף לְמַ֤עַן תִּֽחְיֶה֙ וְיָרַשְׁתָּ֣ אֶת־הָאָ֔רֶץ אֲשֶׁר־יְהֹוָ֥ה אֱלֹהֶ֖יךָ נֹתֵ֥ן לָֽךְ׃ {ס}
(20) Justice, justice shall you pursue, that you may thrive and occupy the land that the LORD your God is giving you.
The first word Tzedek, which means justice, is repeated twice. This indicates that this word is being emphasized.
צדק צדק תרדף. הַלֹּךְ אַחַר בֵּית דִּין יָפֶה (ספרי; סנהדרין ל"ב):
צדק צדק תרדף JUSTICE, JUSTICE SHALT THOU PURSUE — go to (search after) a reliable court (Sifrei Devarim 144:14; Sanhedrin 32b).
Rashi tells us that to find justice we must find a fare, unbiased judge.
לֹא תִּקַּח שֹׁחַד וְגוֹ'. כֵּיוָן שֶׁנּוֹתֵן הַדַּיָּן אֶת לִבּוֹ עַל הַשֹּׁחַד, נַעֲשֶׂה עִוֵּר בַּדִּין וְאֵינוֹ יָכֹל לָדוּן אוֹתוֹ בֶּאֱמֶת.
(Deut. 16:19, cont.:) “You shall not take a bribe.” When the judge sets his heart on a bribe, he becomes blind to justice and he is unable to judge [a case] honestly.
צדק צדק. עם בעלי הריב ידבר וטעם שני פעמים לדבר צדק שירויח בו או יפסיד או פעם אחר פעם כל ימי היותך או לחזוק:
JUSTICE, JUSTICE. Moses speaks to the disputants. Moses repeats the word justice to indicate that one should pursue justice whether one gains or loses. Or the word is repeated to indicate that one should pursue justice as long as one exists; or the word is repeated for emphasis.
כדריש לקיש דריש לקיש רמי כתיב (ויקרא יט, טו) בצדק תשפוט עמיתך וכתיב (דברים טז, כ) צדק צדק תרדף הא כיצד כאן בדין מרומה כאן בדין שאין מרומה
This distinction is in accordance with the statement of Reish Lakish, as Reish Lakish raises a contradiction between two verses: It is written in one verse: “In justice shall you judge your neighbor” (Leviticus 19:15), and it is written in another verse: “Justice, justice, shall you follow” (Deuteronomy 16:21), with the repetition indicating that it is not enough to merely judge with justice. He continues: How can these texts be reconciled? Here, this latter verse is stated with regard to a possibly fraudulent trial, where the court must take extra care to judge with justice; and there, that former verse is stated with regard to a trial that does not appear fraudulent.
(א) וַיְבָ֣רֶךְ אֱלֹהִ֔ים אֶת־נֹ֖חַ וְאֶת־בָּנָ֑יו וַיֹּ֧אמֶר לָהֶ֛ם פְּר֥וּ וּרְב֖וּ וּמִלְא֥וּ אֶת־הָאָֽרֶץ׃ (ב) וּמוֹרַאֲכֶ֤ם וְחִתְּכֶם֙ יִֽהְיֶ֔ה עַ֚ל כׇּל־חַיַּ֣ת הָאָ֔רֶץ וְעַ֖ל כׇּל־ע֣וֹף הַשָּׁמָ֑יִם בְּכֹל֩ אֲשֶׁ֨ר תִּרְמֹ֧שׂ הָֽאֲדָמָ֛ה וּֽבְכׇל־דְּגֵ֥י הַיָּ֖ם בְּיֶדְכֶ֥ם נִתָּֽנוּ׃ (ג) כׇּל־רֶ֙מֶשׂ֙ אֲשֶׁ֣ר הוּא־חַ֔י לָכֶ֥ם יִהְיֶ֖ה לְאׇכְלָ֑ה כְּיֶ֣רֶק עֵ֔שֶׂב נָתַ֥תִּי לָכֶ֖ם אֶת־כֹּֽל׃ (ד) אַךְ־בָּשָׂ֕ר בְּנַפְשׁ֥וֹ דָמ֖וֹ לֹ֥א תֹאכֵֽלוּ׃ (ה) וְאַ֨ךְ אֶת־דִּמְכֶ֤ם לְנַפְשֹֽׁתֵיכֶם֙ אֶדְרֹ֔שׁ מִיַּ֥ד כׇּל־חַיָּ֖ה אֶדְרְשֶׁ֑נּוּ וּמִיַּ֣ד הָֽאָדָ֗ם מִיַּד֙ אִ֣ישׁ אָחִ֔יו אֶדְרֹ֖שׁ אֶת־נֶ֥פֶשׁ הָֽאָדָֽם׃ (ו) שֹׁפֵךְ֙ דַּ֣ם הָֽאָדָ֔ם בָּֽאָדָ֖ם דָּמ֣וֹ יִשָּׁפֵ֑ךְ כִּ֚י בְּצֶ֣לֶם אֱלֹהִ֔ים עָשָׂ֖ה אֶת־הָאָדָֽם׃
(1) God blessed Noah and his sons, and said to them, “Be fertile and increase, and fill the earth. (2) The fear and the dread of you shall be upon all the beasts of the earth and upon all the birds of the sky—everything with which the earth is astir—and upon all the fish of the sea; they are given into your hand. (3) Every creature that lives shall be yours to eat; as with the green grasses, I give you all these. (4) You must not, however, eat flesh with its life-blood in it. (5) But for your own life-blood I will require a reckoning: I will require it of every beast; of man, too, will I require a reckoning for human life, of every man for that of his fellow man! (6) Whoever sheds the blood of man, By man shall his blood be shed; For in His image Did God make man.
וטעם באדם. בעדים. או לעיני הכל. או בעבור האדם שנשפך דמו וכמוהו רבים:
[WHOSO SHEDDETH MAN’S BLOOD, BY MAN SHALL HIS BLOOD BE SHED.] This is a further elaboration. It may also be taken, and this appears most likely, as a command to the sons of Noah to execute murderers. The term ba-adam (by man) can be interpreted in one of three ways: in front of witnesses; in front of people; or because a man was killed. There are many other such instances.
באדם דמו ישפך. עונש שמענו, אזהרה מנין? ת״ל ״לא תרצח״.
באדם דמו ישפך, “his blood will be spilled by a fellow human being.” Here the Torah revealed the penalty for murder. Where had it issued the warning not to commit murder? This is found in Exodus 20,13: לא תרצח, “do not commit murder!”
שׁוּב מַעֲשֶׂה בְּגוֹי אֶחָד שֶׁבָּא לִפְנֵי שַׁמַּאי. אָמַר לוֹ: גַּיְּירֵנִי עַל מְנָת שֶׁתְּלַמְּדֵנִי כׇּל הַתּוֹרָה כּוּלָּהּ כְּשֶׁאֲנִי עוֹמֵד עַל רֶגֶל אַחַת! דְּחָפוֹ בְּאַמַּת הַבִּנְיָן שֶׁבְּיָדוֹ. בָּא לִפְנֵי הִלֵּל, גַּיְירֵיהּ. אָמַר לוֹ: דַּעֲלָךְ סְנֵי לְחַבְרָךְ לָא תַּעֲבֵיד — זוֹ הִיא כׇּל הַתּוֹרָה כּוּלָּהּ, וְאִידַּךְ פֵּירוּשַׁהּ הוּא, זִיל גְּמוֹר.
There was another incident involving one gentile who came before Shammai and said to Shammai: Convert me on condition that you teach me the entire Torah while I am standing on one foot. Shammai pushed him away with the builder’s cubit in his hand. This was a common measuring stick and Shammai was a builder by trade. The same gentile came before Hillel. He converted him and said to him: That which is hateful to you do not do to another; that is the entire Torah, and the rest is its interpretation. Go study.
Rabbi Hillel told the person who he converted that the essential lesson of Torah is to not do what is hateful for them to other people. The rest of the Torah supports this position.
דעלך סני לחברך לא תעביד - ריעך וריע אביך אל תעזוב (משלי כז) זה הקב"ה אל תעבור על דבריו שהרי עליך שנאוי שיעבור חבירך על דבריך ל"א חבירך ממש כגון גזלה גנבה ניאוף ורוב המצות:
Do not do that which is hateful to your fellow - 'Do not forsake your fellow or your father's fellow' (Proverbs 27:10) This refers to the Holy Blessed One. Do not disobey His commandments, for it is hateful unto you when a friend disobeys yours. To put it another way: 'Your fellow', literally, in the cases of thievery, kidnapping, sexual impropriety, and the majority of the commandments.
Rashi lets us know that the things people do that are hateful to others are hateful to God.