Hesabu 31 : 19 Numbers chapter 31 verse 19

Nanyi fanyeni matuo yenu nje ya marago muda wa siku saba; mtu awaye yote aliyemwua mtu, na awaye yote aliyemgusa mtu aliyeuawa, jitakaseni nafsi zenu siku ya tatu, na siku ya saba, ninyi na mateka yenu.
soma Mlango wa 31

Encamp you outside of the camp seven days: whoever has killed any person, and whoever has touched any slain, purify yourselves on the third day and on the seventh day, you and your captives.