Numbers 31:19
And do ye abide without the camp seven days: whoever hath killed any person, and whoever hath touched any slain, purify both yourselves and your captives on the third day, and on the seventh day.And do ye abide without the camp seven days: whoever hath killed any person, and whoever hath touched any slain, purify both yourselves and your captives on the third day, and on the seventh day.