Water of jealousy
A phrase employed (not, however, in Scripture) to denote the water used in the solemn ordeal prescribed by the law of Moses (Numbers 5:11-31) in cases of "jealousy."
Water of purification
Used in cases of ceremonial cleansings at the consecration of the Levites (Numbers 8:7). It signified, figuratively, that purifying of the heart which must characterize the servants of God.
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 (Numbers 19).