Numbers 19:9

And a man [that is] clean shall gather up the ashes of the heifer, and lay [them] up without the camp in a clean place, and it shall be kept for the congregation of the children of Israel for a {e} water of separation: it [is] a purification for sin.

(e) Or, the water of separation because they that were separate due to their uncleanness, were sprinkled with it and made clean, Nu 8:7. It is also called holy water, because it was ordained for a holy use, Nu 1:17.
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