At the heart of Leviticus are the foundations of a civilized society: judge your fellow fairly, don't stand idly by the blood of your fellow, and offer a reproach to another person who is sinful.
As we review these texts you might ask:
Who is your fellow? Is there a limiting definition?
Does the society we desire treat rich and poor equally?
Have you profited because others have been denied economic opportunity?
When others are harmed, what is our obligation to act?
How do you "reprove" others who cause harm by their behaviors?
When you call out people for their sinfulness, how do your own safety concerns factor in?
The Gemara asks: And with regard to all of the other transgressions in the Torah, is punishment not exacted from the entire world? But isn’t it written: “And they shall stumble one upon another” (Leviticus 26:37)? This verse is homiletically interpreted to mean that they shall stumble spiritually, one due to the iniquity of another, which teaches that the entire Jewish people are considered guarantors for one another. Apparently, any transgression makes the entire world liable to be punished.
Mishneh Torah, Human Dispositions 6:7 (Maimonides 12th C)
He who beholds his fellow stooping to sin or following an unrighteous path, is obliged to return him toward the good, and to let him know that he is actually sinning against himself in pursuing wicked deeds for, it is said: "And thou shalt indeed rebuke thy neighbor" (Lev. 19.17). He who rebukes his fellow, whether it be regarding a sin committed between man and man, or whether it be regarding matters between man and God, it is essential that the rebuke be administered only between them both; and he shall speak to him calmly, employing soft language, telling him that he does not speak of it to him, save for his own good, to bring him to a life in the world to come. If he receive it attentively from him, it is well; if not, he should rebuke him a second, even a third time. So is the constant duty of a man to continue to rebuke his fellow, even until the sinner strike him, and say unto him: "I will not listen". He in whose power it is to prevent sin and does not take the means to prevent it, he himself is ultimately overtaken by their sin, since it was possible for him to prevent them.
Three discussions from Talmud are excerpted below. These selections build upon fundamental principles that are the underpinnings of Judaism: respect for others, peace, justice, and social responsibility. The sages of the Talmud demand that we consider if respect, peace, justice, and social responsibility are universal concepts or merely reserved for a select few. We know these principles from Torah and the prophetic writings: (Deut. 10:18-19) (Jer. 9:23-24) (Ps. 10:17-18) They are principles of universal application benefitting all humanity.
רַב וְרַבִּי חֲנִינָא וְרַבִּי יוֹחָנָן וְרַב חֲבִיבָא מַתְנוּ: בְּכוּלֵּיהּ דְּסֵדֶר מוֹעֵד כָּל כִּי הַאי זוּגָא חַלּוֹפֵי רַבִּי יוֹחָנָן וּמְעַיֵּיל רַבִּי יוֹנָתָן. כׇּל מִי שֶׁאֶפְשָׁר לִמְחוֹת לְאַנְשֵׁי בֵיתוֹ וְלֹא מִיחָה — נִתְפָּס עַל אַנְשֵׁי בֵיתוֹ. בְּאַנְשֵׁי עִירוֹ — נִתְפָּס עַל אַנְשֵׁי עִירוֹ. בְּכָל הָעוֹלָם כּוּלּוֹ — נִתְפָּס עַל כָּל הָעוֹלָם כּוּלּוֹ. אָמַר רַב פָּפָּא: וְהָנֵי דְּבֵי רֵישׁ גָּלוּתָא מִיתַּפְסוּ אַכּוּלֵּי עָלְמָא. כִּי הָא דְּאָמַר רַבִּי חֲנִינָא: מַאי דִכְתִיב ״ה׳ בַּמִּשְׁפָּט יָבֹא עִם זִקְנֵי עַמּוֹ וְשָׂרָיו״
It was related that Rav, and Rabbi Ḥanina, and Rabbi Yoḥanan, and Rav Ḥaviva taught the statement cited below. The Gemara comments: Throughout the order of Moed, wherever this pair of Sages is mentioned, exchange Rabbi Yoḥanan and insert Rabbi Yonatan in his place. In any event, they said: Anyone who had the capability to effectively protest the sinful conduct of the members of his household and did not protest, he himself is apprehended for the sins of the members of his household and punished. If he is in a position to protest the sinful conduct of the people of his town, and he fails to do so, he is apprehended for the sins of the people of his town. If he is in a position to protest the sinful conduct of the whole world, and he fails to do so, he is apprehended for the sins of the whole world. Rav Pappa said: And the members of the household of the Exilarch were apprehended and punished for the sins of the whole world. Because their authority extends across the world, it is in their hands to ensure that nobody commit a transgression. As indicated by that which Rabbi Ḥanina said: What is the meaning of that which is written: “The Lord will enter into judgment with the Elders of His people and its princes, saying: It is you who have eaten up the vineyard; the robbery of the poor is in your houses” (Isaiah 3:14)?
See also Sanhedrin 73a - 74a with regard to the obligation to rescue.