'Impurity' in the Bible

And he saith to them, 'Hear me, O Levites, now, sanctify yourselves, and sanctify the house of Jehovah, God of your fathers, and bring out the impurity from the sanctuary,

And the priests went into the inner [part] of the house of Yahweh to purify [it]. And they brought out all the impurity that they found in the temple of Yahweh [out] to the courtyard of the house of Yahweh. And the Levites took [them] to bring [them] outside to the Wadi Kidron.