'Unclean' in the Bible

Now Joshua was clothed in unclean robes, and he was in his place before the angel.

And he made answer and said to those who were there before him, Take the unclean robes off him, and let him be clothed in clean robes;

In that day there will be a fountain open to the family of David and to the people of Jerusalem, for sin and for that which is unclean.

And it will come about on that day, says the Lord of armies, that I will have the names of the images cut off out of the land, and there will be no more memory of them: and I will send all the prophets and the unclean spirit away from the land.