Numbers 31:19-21

New International Version - UK

¹⁹ ‘Anyone who has killed someone or touched someone who was killed must stay outside the camp seven days. On the third and seventh days you must purify yourselves and your captives. ²⁰ Purify every garment as well as everything made of leather, goat hair or wood.’

²¹ Then Eleazar the priest said to the soldiers who had gone into battle, ‘This is what is required by the law that the Lord gave Moses: