If a person is found to have real tzara'at, his clothes should be torn, his hair should be grown and he should act otherwise like a mourner. He should cry out: "I am ritually impure! I am ritually impure!" Over and over.
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Leviticus essentially creates a primitive quarantine system. The idea is that the "camp" of Israel -- the tribes still wandering in the wilderness after leaving Egypt -- is to be kept pure.
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