Numbers 31:12

31:12 They brought the captives and the spoils and the plunder to Moses, to Eleazar the priest, and to the Israelite community, to the camp on the plains of Moab, along the Jordan River across from Jericho.

Numbers 31:19

Purification After Battle

31:19 “Any of you who has killed anyone or touched any of the dead, remain outside the camp for seven days; purify yourselves and your captives on the third day, and on the seventh day.