הַמְרַגֵּל בַּחֲבֵרוֹ עוֹבֵר בְּלֹא תַּעֲשֶׂה שֶׁנֶּאֱמַר (ויקרא יט טז) "לֹא תֵלֵךְ רָכִיל בְּעַמֶּיךָ". וְאַף עַל פִּי שֶׁאֵין לוֹקִין עַל דָּבָר זֶה עָוֹן גָּדוֹל הוּא וְגוֹרֵם לַהֲרֹג נְפָשׁוֹת רַבּוֹת מִיִּשְׂרָאֵל. לְכָךְ נִסְמָךְ לוֹ (ויקרא יט טז) "וְלֹא תַעֲמֹד עַל דַּם רֵעֶךָ". צֵא וּלְמַד מָה אֵרַע לְדוֹאֵג הָאֲדֹמִי: אֵי זֶהוּ רָכִיל. זֶה שֶׁטּוֹעֵן דְּבָרִים וְהוֹלֵךְ מִזֶּה לָזֶה וְאוֹמֵר כָּךְ אָמַר פְּלוֹנִי כָּךְ וְכָךְ שָׁמַעְתִּי עַל פְּלוֹנִי. אַף עַל פִּי שֶׁהוּא אֱמֶת הֲרֵי זֶה מַחֲרִיב אֶת הָעוֹלָם. יֵשׁ עָוֹן גָּדוֹל מִזֶּה עַד מְאֹד וְהוּא בִּכְלַל לָאו זֶה וְהוּא לָשׁוֹן הָרַע. וְהוּא הַמְסַפֵּר בִּגְנוּת חֲבֵרוֹ אַף עַל פִּי שֶׁאוֹמֵר אֱמֶת. אֲבָל הָאוֹמֵר שֶׁקֶר נִקְרָא מוֹצִיא שֵׁם רַע עַל חֲבֵרוֹ. אֲבָל בַּעַל לָשׁוֹן הָרַע זֶה שֶׁיּוֹשֵׁב וְאוֹמֵר כָּךְ וְכָךְ עָשָׂה פְּלוֹנִי וְכָךְ וְכָךְ הָיוּ אֲבוֹתָיו וְכָךְ וְכָךְ שָׁמַעְתִּי עָלָיו וְאָמַר דְּבָרִים שֶׁל גְּנַאי. עַל זֶה אָמַר הַכָּתוּב (תהילים יב ד) "יַכְרֵת ה' כָּל שִׂפְתֵי חֲלָקוֹת לָשׁוֹן מְדַבֶּרֶת גְּדלוֹת":
A person who collects gossip about a colleague violates a prohibition as [Leviticus 19:16] states: "Do not go around gossiping among your people." Even though this transgression is not punished by lashes, it is a severe sin and can cause the death of many Jews. Therefore, [the warning]: "Do not stand still over your neighbor's blood" is placed next to it in the Torah [ibid.]. See what happened [because of] Doeg, the Edomite. Who is a gossiper? One who collects information and [then] goes from person to person, saying: "This is what so and so said;" "This is what I heard about so and so." Even if the statements are true, they bring about the destruction of the world. There is a much more serious sin than [gossip], which is also included in this prohibition: lashon horah, i.e., relating deprecating facts about a colleague, even if they are true. [Lashon horah does not refer to the invention of lies;] that is referred to as defamation of character. Rather, one who speaks lashon horah is someone who sits and relates: "This is what so and so has done;" "His parents were such and such;" "This is what I have heard about him," telling uncomplimentary things. Concerning this [transgression], the verse [Psalms 12:4] states: "May God cut off all guileful lips, the tongues which speak proud things..."
ד״א לא תלך רכיל אבל אם שמעת עצה על חברך להרגו לא תעמוד על דמו אלא הודע לו העצה.
Still another interpretation of our verse: ordinarily the rule of not to go around and bear tales applies. However, if you became privy to a plot being hatched to kill an innocent person you must not plead this law as an excuse not to have warned the endangered party, or have reported it to the police.