In the Apostolic Constitutions, VIII. xi, this duty is assigned to a sub-deacon: “Let one of the sub-deacons bring water to wash the hands of the priests, which is a symbol of the purity of those souls that are devoted to God.” See Dictionary of Christian Antiquities, “Lavabo.” The Priest who celebrates the Eucharist is here distinguished by the title ἱερεύς from the other Presbyters who stood round the altar.