Numbers 31:19
And ye, encamp ye at the outside of the camp seven days -- any who hath slain a person, and any who hath come against a pierced one, ye cleanse yourselves on the third day, and on the seventh day -- ye and your captives;
Numbers 5:2
'Command the sons of Israel, and they send out of the camp every leper, and every one with an issue, and every one defiled by a body;
Numbers 19:11-22
He who is coming against the dead body of any man -- is unclean seven days;
1 Chronicles 22:8
and the word of Jehovah is against me, saying, Blood in abundance thou hast shed, and great wars thou hast made: thou dost not build a house to My name, for much blood thou hast shed to the earth before Me.