'Unclean' in the Bible

Jehoiada also stationed inspectors at the LORD's Temple so that no one would enter who was ritually unclean in any manner.

"Pay attention to me, you descendants of Levi! Consecrate yourselves and the Temple of the LORD God of your ancestors by taking out from the Holy Place whatever is unclean. Our ancestors have been unfaithful. They practiced what the LORD considers to be evil, abandoned him, turned their faces away from the place where the LORD resides, and turned their backs to him.

The priests entered the inner courts of the LORD's Temple to cleanse it, and they brought out everything unclean that they found there to the outer court of the LORD's Temple. Then the descendants of Levi carried everything from there out to the Kidron Valley.

Because there were so many in the assembly that had not consecrated themselves, therefore the descendants of Levi supervised the slaughter of the Passover sacrifices on behalf of everyone who remained unclean, so they could be consecrated to the LORD.