'Unclean' in the Bible

Then Haggai said, "If one who is unclean from contact with a corpse touches any of these, will it become unclean?" The priests answered, "Yes, it will be become unclean."

And Haggai answered and said, " 'So [it is with] this people, and [with] this nation before me,' {declares} Yahweh, 'and so [it is with] every kind of work of their hands; and what they offer there [is] unclean.