Kedoshim, Section 1
1) (Vayikra 19:1) "And the L–rd spoke to Moses, saying (Vayikra 19:2) Speak to the entire congregation of the children of Israel, and say to them: Holy shall you be." We are hereby taught that this section was stated in the presence of all. Why so? Because most of the major tenets of Torah are inherent in it. "Holy shall you be": Separate yourselves (from arayoth.) "Holy shall you be, for holy am I, the L–rd your G d." If you sanctify yourselves, I will consider it as if you had sanctified Me, and if you do not sanctify yourselves, I will consider it as if you had not sanctified Me. — But perhaps the meaning is: If you sanctify Me, I am holy, and if not I am not holy. It is, therefore, written "for holy am I" — I remain in My holiness whether or not I am sanctified (by men). Abba Shaul says: What is the duty of the King's retinue? To follow in the footsteps of the King (and to be holy).