'Clean' in the Bible

Yet Saul did not say anything that day, for he thought, “It is an incident [of some kind] and he is not [ceremonially] clean—surely he is unclean.”

David answered the priest, “Be assured that women have been kept from us in these three days since I set out, and the bodies of the young men were consecrated (ceremonially clean), although it was an ordinary (unconsecrated) journey; so how much more will their vessels be holy today?”