'Unclean' in the Bible

Then Haggai said, "If one who is unclean by reason of a dead body touch any of these, will it be unclean?" The priests answered, "It will be unclean."

Then Haggai answered, "'So is this people, and so is this nation before me,' says Yahweh; 'and so is every work of their hands. That which they offer there is unclean.