asperges (n.)

sprinkling ritual of the Catholic church, also an antiphon intoned or sung during this, 1550s, from Late Latin asperges, noun use of 2nd person singular future indicative of Latin aspergere "to scatter, strew upon, sprinkle," from ad "to" (see ad-) + spargere "to sprinkle" (see sparse). The word is taken from the phrase Asperges me, Domine, hyssopo et mundabor, from the 51st Psalm (Vulgate), sung during the rite of sprinkling a congregation with holy water. Old English used onstregdan as a loan-translation of Latin aspergere.