Leviticus 14:51

Then he shall take the {cedar wood} and the hyssop and {the crimson thread} and the living bird, and he shall dip them in the slaughtered bird's blood and in the fresh water, and he shall spatter [them] on the house seven times.

Psalm 51:7

Purify me with hyssop, and I shall be clean. Wash me, and I shall be whiter than snow.

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