You Are Kadosh

קְדֹשִׁ֣ים תִּהְי֑וּ כִּ֣י קָד֔וֹשׁ אֲנִ֖י י״י֥ אֱלֹקיכם אִ֣ישׁ אִמּ֤וֹ וְאָבִיו֙ תִּירָ֔אוּ וְאֶת־שַׁבְּתֹתַ֖י תִּשְׁמֹ֑רוּ אֲנִ֖י י״י֥ אֱלֹקכים.  What is the connection between these three things?  Rav Tzvi Yehuda says that there are two elements to קדושים תהיו.  One element is as the Rishonim explain a commandment to be holy each according to their own explanation.  The second element is that the possuk is a guarantee that you will be holy. Where does this kedusha come from? אֲנִ֖י י״י֥ אֱלֹקיכם, because of the connection to Hashem.  What if the person is a sinner, where is his connection to Hashem.  The Or Hachayim at the beginning of Korach explains that Yaakov is not mentioned in the lineage of Korach because Korach's sin went so far as to destroy even the innate kedusha that he had in him from his holy forefathers, but the connection to Yaakov was not destroyed which allows for teshuva (see how he reads it into the Gemorah.)  It is the connection to the Avos that always remains.  The way to enhance this innate connection with the Avos is through keeping Shabbos (the three meals correspond to the three Avos and as the Gemorah Shabbos (118a) says it is connected to the נחלה of Yaakov.)  The possuk is enumerating things that demonstrate our innate kedusha. (See Shviley Pinchas 5780.)  

This is the common thread between the two parshiot of Acharei Mos and Kedoshim.  The two goats chosen for the korban and to be sent off the cliff looked identical.  The Alter Rebbe says that this represents that even when there is no clear difference between the Jew and his neighbor, still את יעקב אהבתי ואת עשו שנאתי.  It is the innate kedusha that shines through on Yom Kippur.  This is a whole different approach to קדושים תהיו, it is not something one needs to strive to reach but merely to awaken the inner kedusha within.