God has always wanted Israel to be holy, separated from every thing unclean. Over the years that has resulted in many attempts to be righteous through strict rules, but righteousness comes from within. Then and only then will the unclean become distasteful to Israel. Then and only then will she be separate and holy.
11: Depart! Depart! Go out from there, touch no unclean thing; go out from the midst of her, be clean, you who bear the vessels of the Lord.
12: For you shall not go out with haste, nor go by flight; for the Lord will go before you, and the God of Israel will be your rear guard.
PRAY FOR ISRAEL TO FLEE FROM EVERY VILE AND UNCLEAN THING.