19:2י״ט:ב׳
1 א

דבר אל כל עדת בני ישראל. מְלַמֵּד שֶׁנֶּאֶמְרָה פָרָשָׁה זוֹ בְּהַקְהֵל מִפְּנֵי שֶׁרֹב גּוּפֵי תוֹרָה תְלוּיִּין בָּהּ (ספרא):

דבר אל כל עדת בני ישראל SPEAK UNTO ALL THE CONGREGATION OF THE CHILDREN OF ISRAEL — This (the addition of the words כל עדת) teaches us that this section was proclaimed in full assembly because most of the fundamental teachings of the Torah are dependent on it (contained in it) (Sifra, Kedoshim, Section 1 1; Vayikra Rabbah 24:5).

2 ב

קדשים תהיו. הֱווּ פְרוּשִׁים מִן הָעֲרָיוֹת וּמִן הָעֲבֵרָה, שֶׁכָּל מָקוֹם שֶׁאַתָּה מוֹצֵא גֶדֶר עֶרְוָה אַתָּה מוֹצֵא קְדֻשָּׁה, אִשָּׁה זֹנָה וַחֲלָלָה וְגוֹ' אֲנִי ה' מְקַדִּשְׁכֶם (ויקרא כ"א), וְלֹא יְחַלֵּל זַרְעוֹ, אֲנִי ה' מְקַדְּשׁוֹ (שם), קְדֹשִׁים יִהְיוּ, אִשָּׁה זֹנָה וַחֲלָלָה (שם):

קדשים תהיו YE SHALL BE HOLY — This means, keep aloof from the forbidden sexual relations just mentioned and from sinful thoughts. [It is evident that this is the meaning of קדשים תהיו because] wherever you find in the Torah a command to fence yourself in against such relations you also find mention of “holiness". Examples are: (Leviticus 21:7) “[They shall not take] a wife that is a harlot, or a profane etc.", and in the next verse "for I, the Lord, who sanctifieth you, [am holy]"; (Leviticus 21:15) “Neither shall he profane his seed (by the forbidden unions mentioned in the preceding verses) for I the Lord do sanctify him"; (Leviticus 21:6) "They shall be holy… followed by (v. 7) "[they shall not take] a wife that is a harlot or a profane" (cf. Vayikra Rabbah 24:4-6).