Leviticus 15:13

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13 ‘Now when the man with the discharge becomes cleansed from his discharge, then he ^ashall count off for himself seven days for his cleansing; he shall then wash his clothes and bathe his body in ¹running water and will become clean.

Numbers 19:9-12

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9 Now a man who is clean shall gather up the ashes of the heifer and deposit them outside the camp in a clean place, and ¹the congregation of the sons of Israel shall keep it as ^awater to remove impurity; it is ²purification from sin. 10 And the one who gathers the ashes of the heifer ^ashall wash his clothes and be unclean until evening; and it shall be a perpetual statute to the sons of Israel and to the sojourner who sojourns among them.
11 ‘^aThe one who touches the corpse of any ¹person shall be unclean for seven days. 12 That one shall ^apurify himself from uncleanness with ¹the water on the third day and on the seventh day, and then he will be clean; but if he does not purify himself on the third day and on the seventh day, he will not be clean.