Numbers 31:19
Camp outside the camp for seven days; whoever has killed any person and whoever has touched any dead body, purify yourselves and your captives, on the third day and on the seventh day.
Numbers 5:2
“Command the Israelites to send away from the camp every leper and everyone who has a discharge, and whoever is defiled [that is, ceremonially unclean] by [coming in contact with] the dead.
Numbers 19:11-22
‘The one who touches the dead body of any person shall be unclean for seven days.
1 Chronicles 22:8
But the word of the Lord came to me, saying, ‘You have shed much blood and have waged great wars; you shall not build a house for My Name, because you have shed so much blood on the earth before me.