Numbers 31:19
And do all of you abide without the camp seven days: whosoever has killed any person, and whosoever has touched any slain, purify both yourselves and your captives on the third day, and on the seventh day.
And do all of you abide without the camp seven days: whosoever has killed any person, and whosoever has touched any slain, purify both yourselves and your captives on the third day, and on the seventh day.