Numbers 31:19
And encamp outside the camp seven days; whoever hath killed a person, and whoever hath touched any slain; ye shall purify yourselves on the third day, and on the seventh day, you and your captives.
Numbers 5:2
Command the children of Israel, that they put out of the camp every leper, and every one that hath an issue, and whosoever is defiled by a dead person:
Numbers 19:11-22
He that toucheth a dead person, any dead body of a man, shall be unclean seven days.
1 Chronicles 22:8
But the word of Jehovah came to me saying, Thou hast shed blood abundantly, and hast made great wars: thou shalt not build a house unto my name, for thou hast shed much blood upon the earth in my sight.