Deuteronomy 21:5,6

By their word shall every controversy be tried That is, every one of this kind, every one that shall arise about any stroke, whether such a mortal stroke as is here spoken of, or any other, or wound given by one man to another. In these matters they shall give sentence, being consulted by the elders or judges of the cities, Deuteronomy 17:9. The elders shall wash their hands Protesting their innocence, says a learned Jewish writer, (Chazkuni,) in these words: “As our hands are now clean, so are we innocent of the blood which has been shed.” See an allusion to this, Psalms 26:6; Matthew 27:24.