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,
BSB · 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:
KJV · King James Version
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.
WEB · World English Bible
And all the elders of that city, who are nearest unto the slain man, shall wash their hands over the heifer whose neck was broken in the valley;
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

wash their hands
Washing the hands was anciently a symbolical action, denoting that the person was innocent of the crime in question.
Job 9:30; Psalm 19:12; Psalm 26:6; Psalm 51:2, 7, 14; Psalm 73:13; Jeremiah 2:22; Matthew 27:24, 25; Hebrews 9:10