'Unclean' in the Bible

Then Haggai said, “If one who is unclean from a corpse touches any of these, will the latter become unclean?” And the priests answered, “It will become unclean.”

Then Haggai said, “‘So is this people. And so is this nation before Me,’ declares the Lord, ‘and so is every work of their hands; and what they offer there is unclean.