In the liturgy of the Roman Catholic Church, Agnus Dei is a name given to the formula recited thrice by the priest at Mass (except on Good Friday and Holy Saturday) in the Roman rite. It occurs towards the end of the Canon, after the prayer "Haec commixtio", etc. Having finished saying this prayer, the priest covers the chalice with the pall, genuflects, rises, inclines his head (but not his body) profoundly towards the altar and, with hands joined before his breast (and not, therefore, resting on the altar), says with a loud voice: "Agnus Dei, qui tollis peccata mundi, miserere nobis" (Lamb of God, Who takest away the sins of the world, have mercy on us), repeats the formula unchanged, and still a third time, substituting now "dona nobis pacem" (grant us peace) for "miserere nobis", meanwhile striking his breast thrice, once at each "miserere nobis" and once at "Dona nobis pacem", with the right hand (the left hand resting throughout, from the first "Miserere", on the altar).
The name Agnus Dei also has been given to certain discs of wax impressed with the figure of a lamb and blessed at stated seasons by the Pope. They are sometimes round, sometimes oval in diameter. The lamb usually bears a cross or flag, while figures of saints or the name and arms of the Pope are also commonly impressed on the reverse. These Agnus Deis may be worn suspended round the neck, or they may be preserved as objects of devotion. In virtue of the consecration they receive, they are regarded, like holy water, blessed palms, etc., as "Sacramentals".
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