Leviticus 15:13

13“And when the one with a discharge is cleansed of his discharge, then ahe shall count for himself seven days for his cleansing, and wash his clothes. And he shall bathe his body in fresh water and shall be clean.

Numbers 19:9-12

9And a man who is clean shall gather up bthe ashes of the heifer and deposit them outside the camp in a cclean place. And they shall be kept for the water for dimpurity for the congregation of the people of Israel; it is a sin offering. 10And the one who gathers the ashes of the heifer eshall wash his clothes and be unclean until evening. And this shall be a perpetual statute for the people of Israel, and for the stranger who sojourns among them.

11 f“Whoever touches the dead body of any person shall be unclean seven days. 12He gshall cleanse himself with the water on the third day and on the seventh day, and so be clean. But if he does not cleanse himself on the third day and on the seventh day, he will not become clean.
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