Haggai 2:13-14

Then Haggai said, “If someone who is unclean by contact with a dead body touches any of these, does it become unclean?” The priests answered and said, “It does become unclean.” Then Haggai answered and said, “So is it with this people, and with this nation before me, declares the LORD, and so with every work of their hands. And what they offer there is unclean.