'Hyssop' in the Bible

Then the priest is to take some cedar wood, hyssop, and scarlet material and throw it into the middle of the burning heifer.

A clean person is to take some hyssop, dip it in water, and then sprinkle it on the tent, on every vessel, and on whoever was there (that is, on whoever touched the bones, the killed person, or the dead body, including whoever dug the grave).