'Unclean' in the Bible

For if the blood of goats and oxen, and the dust from the burning of a young cow, being put on the unclean, make the flesh clean:

Looking with care to see that no man among you in his behaviour comes short of the grace of God; for fear that some bitter root may come up to be a trouble to you, and that some of you may be made unclean by it;

Let married life be honoured among all of you and not made unclean; for men untrue in married life will be judged by God.