Numbers 31:19
And ye must abide outside the camp seven days; and whoever has killed any person and whoever has touched any dead body ye shall remove the sin from them on the third and on the seventh day, both of yourselves and of your captives.
Numbers 5:2
Command the sons of Israel that they put out of the camp every leper and every one that has an issue and anyone who is defiled by the dead.
Numbers 19:11-22
He that touches the dead body of any human person shall be unclean seven days.
1 Chronicles 22:8
but the word of the LORD came to me, saying, Thou hast shed blood abundantly and hast made great wars; thou shalt not build a house unto my name because thou hast shed much blood upon the earth in my sight.