Numbers 31:24

Purification After Battle

²³ And anything which may be heated, is to go through the fire and be made clean; but in addition it is to be put in the water of cleaning: and anything which may not go through the fire is to be put in the water. ²⁴ And on the seventh day, after washing your clothing, you will be clean, and then you may come into the tent-circle. ²⁵ And the Lord said to Moses,

Seventh Day

Be Clean

Leviticus 11:25

Whoever takes away the dead body of one of them is to have his clothing washed, and will be unclean till evening.

Leviticus 14:9

And on the seventh day he is to have all the hair cut off his head and his chin and over his eyes--all his hair is to be cut off--and he will have his clothing washed and his body bathed in water and he will be clean.

Leviticus 15:13

And when a man who has a flow from his body is made clean from it, he is to take seven days to make himself clean, washing his clothing and bathing his body in flowing water, and then he will be clean.

Numbers 19:19

Let the clean person do this to the unclean on the third day and on the seventh day: and on the seventh day he is to make him clean; and after washing his clothing and bathing himself in water, he will be clean in the evening.