Water of separation
Used along with the ashes of a red heifer for the ceremonial cleansing of persons defiled by contact with a dead body (Num. 19).
M. G. Easton, Illustrated Bible Dictionary, 3rd edition (1897). Public domain; text from the Christian Classics Ethereal Library. A nineteenth-century Protestant reference: its dates, archaeology and judgements reflect the scholarship of its time and are not Imago Dei's editorial position.