Agnus Dei, referring to the Christian theological concept the Lamb of God, and the associated liturgical text from the Roman Catholic Latin Mass has been set to music by many composers, as it is normally one of the movements or sections in a sung Mass setting or Requiem Mass.[1][2] However, sometimes it stands alone, e.g., it provides the lyrics for the choral arrangement of Samuel Barber's Adagio for Strings.
Based upon John the Baptist's reference in John 1:29 to Jesus ("Behold the Lamb of God that taketh away the sin of the world"), the text in Latin is:
which means:
The text is also part of the use of Agnus Dei in liturgy.
Some examples from full mass settings include: