Asperges is a name given to the rite of sprinkling a congregation with holy water. The name comes from the first word in the 9th verse of Psalm 51 in the Latin translation, the Vulgate, which is sung during the Traditional form of the rite, except during Eastertide. The 51st Psalm is also one of the antiphons that may be sung in the rite under the Mass of Paul VI.
Read more about Asperges: Mass of Paul VI, Traditional Form, Eastern Orthodox, Lutheranism