Leviticus 20:7,8 - Ellicott's Commentary On The Whole Bible

Sanctify yourselves therefore, and be ye holy. — Rather, Ye shall therefore sanctify yourselves, and ye shall be holy, as the same phrase is rendered in the Authorised Version in Leviticus 11:44. Though it is immaterial which of the two renderings is adopted, it is important that it should be the same in both passages, since the phrase is exactly the same in the original. It is only by keeping the Divine ordinances that the Israelites will attain to that state of holiness which will not only arm them to resist the abominable rites and idolatrous practices denounced in the foregoing verses, but which will enable them to reflect the holiness of their Lord.