דַּבֵּ֞ר אֶל־כָּל־עֲדַ֧ת בְּנֵי־יִשְׂרָאֵ֛ל וְאָמַרְתָּ֥ אֲלֵהֶ֖ם קְדֹשִׁ֣ים תִּהְי֑וּ כִּ֣י קָד֔וֹשׁ אֲנִ֖י יְהוָ֥ה אֱלֹהֵיכֶֽם׃
Speak unto all the congregation of the children of Israel, and say unto them: Ye shall be holy; for I the LORD your God am holy.
Read kabbalistic (mystical) interpretation of Leviticus 19:2: and classical mystical sources.