(טז) לֹא־תֵלֵ֤ךְ רָכִיל֙ בְּעַמֶּ֔יךָ לֹ֥א תַעֲמֹ֖ד עַל־דַּ֣ם רֵעֶ֑ךָ אֲנִ֖י יְהוָֽה׃
(16) Do not peddle gossip among your people...I am the LORD.
One who "peddles gossip"(rechilut) refers to a person who says, "So and so did the following to you..." even though the information is not necessarily negative [but can nevertheless provoke arguments between parties]...since he carries the information around from one person to another, he is called a "peddler" [a traveling salesman of gossip].
There is a sin that is much worse than rechilut, also included in the prohibition of "do not peddle gossip." This is known as lashon hara, or derogatory speech. This refers to someone who speaks in a derogatory manner about someone else--even though what he says is true. Someone who speaks lashon hara will say negative and derogatory things like, "So and so did the following..."
Rambam, Mishneh Torah, De'ot 7:2
[The previous case refers to someone who speaks negative information that is true.] Someone who speaks derogatory or harmful information about someone that is untrue is called slander (motzi shem ra).
(א) וַתְּדַבֵּ֨ר מִרְיָ֤ם וְאַהֲרֹן֙ בְּמֹשֶׁ֔ה עַל־אֹד֛וֹת הָאִשָּׁ֥ה הַכֻּשִׁ֖ית אֲשֶׁ֣ר לָקָ֑ח כִּֽי־אִשָּׁ֥ה כֻשִׁ֖ית לָקָֽח׃ (ב) וַיֹּאמְר֗וּ הֲרַ֤ק אַךְ־בְּמֹשֶׁה֙ דִּבֶּ֣ר יְהוָ֔ה הֲלֹ֖א גַּם־בָּ֣נוּ דִבֵּ֑ר וַיִּשְׁמַ֖ע יְהוָֽה׃ (ג) וְהָאִ֥ישׁ מֹשֶׁ֖ה ענו [עָנָ֣יו] מְאֹ֑ד מִכֹּל֙ הָֽאָדָ֔ם אֲשֶׁ֖ר עַל־פְּנֵ֥י הָאֲדָמָֽה׃ (ס) (ד) וַיֹּ֨אמֶר יְהוָ֜ה פִּתְאֹ֗ם אֶל־מֹשֶׁ֤ה וְאֶֽל־אַהֲרֹן֙ וְאֶל־מִרְיָ֔ם צְא֥וּ שְׁלָשְׁתְּכֶ֖ם אֶל־אֹ֣הֶל מוֹעֵ֑ד וַיֵּצְא֖וּ שְׁלָשְׁתָּֽם׃ (ה) וַיֵּ֤רֶד יְהוָה֙ בְּעַמּ֣וּד עָנָ֔ן וַֽיַּעֲמֹ֖ד פֶּ֣תַח הָאֹ֑הֶל וַיִּקְרָא֙ אַהֲרֹ֣ן וּמִרְיָ֔ם וַיֵּצְא֖וּ שְׁנֵיהֶֽם׃ (ו) וַיֹּ֖אמֶר שִׁמְעוּ־נָ֣א דְבָרָ֑י אִם־יִֽהְיֶה֙ נְבִ֣יאֲכֶ֔ם יְהוָ֗ה בַּמַּרְאָה֙ אֵלָ֣יו אֶתְוַדָּ֔ע בַּחֲל֖וֹם אֲדַבֶּר־בּֽוֹ׃ (ז) לֹא־כֵ֖ן עַבְדִּ֣י מֹשֶׁ֑ה בְּכָל־בֵּיתִ֖י נֶאֱמָ֥ן הֽוּא׃ (ח) פֶּ֣ה אֶל־פֶּ֞ה אֲדַבֶּר־בּ֗וֹ וּמַרְאֶה֙ וְלֹ֣א בְחִידֹ֔ת וּתְמֻנַ֥ת יְהוָ֖ה יַבִּ֑יט וּמַדּ֙וּעַ֙ לֹ֣א יְרֵאתֶ֔ם לְדַבֵּ֖ר בְּעַבְדִּ֥י בְמֹשֶֽׁה׃ (ט) וַיִּֽחַר אַ֧ף יְהוָ֛ה בָּ֖ם וַיֵּלַֽךְ׃ (י) וְהֶעָנָ֗ן סָ֚ר מֵעַ֣ל הָאֹ֔הֶל וְהִנֵּ֥ה מִרְיָ֖ם מְצֹרַ֣עַת כַּשָּׁ֑לֶג וַיִּ֧פֶן אַהֲרֹ֛ן אֶל־מִרְיָ֖ם וְהִנֵּ֥ה מְצֹרָֽעַת׃ (יא) וַיֹּ֥אמֶר אַהֲרֹ֖ן אֶל־מֹשֶׁ֑ה בִּ֣י אֲדֹנִ֔י אַל־נָ֨א תָשֵׁ֤ת עָלֵ֙ינוּ֙ חַטָּ֔את אֲשֶׁ֥ר נוֹאַ֖לְנוּ וַאֲשֶׁ֥ר חָטָֽאנוּ׃ (יב) אַל־נָ֥א תְהִ֖י כַּמֵּ֑ת אֲשֶׁ֤ר בְּצֵאתוֹ֙ מֵרֶ֣חֶם אִמּ֔וֹ וַיֵּאָכֵ֖ל חֲצִ֥י בְשָׂרֽוֹ׃ (יג) וַיִּצְעַ֣ק מֹשֶׁ֔ה אֶל־יְהוָ֖ה לֵאמֹ֑ר אֵ֕ל נָ֛א רְפָ֥א נָ֖א לָֽהּ׃
(1) Miriam and Aaron spoke against Moses because of the Cushite woman he had married: “He married a Cushite woman!” (2) They said, “Has the LORD spoken only through Moses? Has He not spoken through us as well?” The LORD heard it. (3) Now Moses was a very humble man, more so than any other man on earth. (4) Suddenly the LORD called to Moses, Aaron, and Miriam, “Come out, you three, to the Tent of Meeting.” So the three of them went out. (5) The LORD came down in a pillar of cloud, stopped at the entrance of the Tent, and called out, “Aaron and Miriam!” The two of them came forward; (6) and He said, “Hear these My words: When a prophet of the LORD arises among you, I make Myself known to him in a vision, I speak with him in a dream. (7) Not so with My servant Moses; he is trusted throughout My household. (8) With him I speak mouth to mouth, plainly and not in riddles, and he beholds the likeness of the LORD. How then did you not shrink from speaking against My servant Moses!” (9) Still incensed with them, the LORD departed. (10) As the cloud withdrew from the Tent, there was Miriam stricken with snow-white scales! When Aaron turned toward Miriam, he saw that she was stricken with scales. (11) And Aaron said to Moses, “O my lord, account not to us the sin which we committed in our folly. (12) Let her not be as one dead, who emerges from his mother’s womb with half his flesh eaten away.” (13) So Moses cried out to the LORD, saying, “O God, pray heal her!”