Numbers 31:19
Everyone who killed a person or touched a dead body must stay outside the camp seven days. You and your prisoners of war must use the ritual water on the third and seventh days in order to take away your sin.
Numbers 5:2
Command the Israelites to send outside the camp anyone who has a serious skin disease or a discharge or anyone who is unclean from touching a dead body.
Numbers 19:11-22
Those who touch a corpse are ritually unclean for seven days.
1 Chronicles 22:8
The word of Jehovah came to me, saying: 'You have shed much blood and have fought many wars. You are not to build a house for my name. This is because you have shed much blood on the earth in my sight.