Deuteronomy 21:6; Deuteronomy 23:11

Deuteronomy 21:6

6 And all the elders of that city, that are next unto the slain man, shall wash their hands over the heifer that is beheaded in the valley:

Deuteronomy 23:11

11 But it shall be, when evening cometh on, he shall wash himself with water: and when the sun is down, he shall come into the camp again.