The Eternal spoke to Moses, saying: Speak to the whole Israelite community and say to them: You shall be holy, for I, the Eternal your God, am holy. (Leviticus 19:1-2) Parashat K'doshim places before us one of the most difficult commandments in the whole Torah. It's not kashrut or Shabbat, or even the rules of sexual conduct, but rather, the admonition and the expectation to "be holy." Throughout the Torah, we are given rules and statues that tell us what to do. Here are we told what to be. A similar statement is found in Exodus 19:6, where we are commanded to be a "kingdom of priests and a holy people." But what does it mean to be holy? The parashah does not define what holiness is, nor does it tell us what it means to be holy. The guidance it gives us is in the specifics: the who, when, why, and how of the injunction.