Lamb of God modern Roman Catholic Christology, Karl Rahner has continued to elaborate on the analogy that the blood of the Lamb of God, and the water flowing from the side of Christ on Calvary, had a cleansing nature, similar to baptismal water. In this analogy, the blood of the Lamb washed away the sins of humanity in a new baptism, redeeming it from the fall of Adam. In the Mass of the Roman Rite and also in the Eucharist of the Anglican Communion, the Lutheran Church, and the Western Rite of the Orthodox Church the "Agnus Dei" is the invocation to the
Agnus Dei (liturgy) the Roman Missal, § 83, states: "The supplication "Agnus Dei", is, as a rule, sung by the choir or cantor with the congregation responding; or it is, at least, recited aloud. This invocation accompanies the fraction and, for this reason, may be repeated as many times as necessary until the rite has reached its conclusion, the last time ending with the words "dona nobis pacem" ('grant us peace')." In Tridentine Requiem Masses, the first two invocations ended with "dona eis requiem" (give them rest) instead of "miserere nobis", and the last with "dona eis requiem sempiternam" (give them rest eternal).