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An esoteric discussion of the kinds of liquids producing tum’ah leads to a citation from Haggai interrogating the priests, which informs Rav Yoel Bin Nun on a wonderful historical review of Chanukah.
Though the sacrifices might be technically pure, sinful acts are equivalent to offering impure sacrifices. Haggai emphasizes that such sacrifices were harmful to the relationship between the Jewish people and God.