Leviticus 20:7

Sanctify yourselves therefore,.... By abstaining from such impious and idolatrous practices, and separating themselves from all that gave into them, as well as by observing the holy commandments of the Lord; otherwise internal sanctification is not the work of man, but of the Lord himself, as in Leviticus 20:8:

and be ye holy; or a separate people from all others in worship and conversation:

for I [am] the Lord your God; who is a holy God, and therefore it became them to be holy, in imitation of him, Leviticus 19:2.