'Uncleanness' in the Bible

Then he said to them, “Listen to me, O Levites. Consecrate yourselves now, and consecrate the house of the Lord, the God of your fathers, and carry the uncleanness out from the holy place.

And the priests went into the inner part of the house of the LORD, to cleanse it, and brought out all the uncleanness that they found in the temple of the LORD into the court of the house of the LORD. And the Levites took it, to carry it out abroad into the brook Kidron.