Deuteronomy 21:6
Then all the elders of the city nearest the victim shall wash their hands by the stream over the heifer whose neck has been broken,
Berean Standard Bible
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:
All the elders of that city which is nearest to the slain man shall wash their hands over the heifer whose neck was broken in the valley.