17-18 Before you can be made clean, someone who is clean must take some of the ashes from the burnt cow and stir them into a pot of spring water. That same person must dip a hyssop branch in the water and ashes, then sprinkle it on the tent and everything in it, including everyone who was inside. If you have touched a human bone, a grave, or a dead body, you must be sprinkled with that water.