Today we see that John the Baptist calls Jesus “the Lamb of God.” A lamb is the young of a sheep. The Jews sacrificed lambs at the feast of Weeks, the feast of Tabernacles, the Day of Atonement, and the Passover. The lamb was also used as a metaphor for the Jews in their relationship with God: “The Lord is my Shepherd.” Prophecies like the Suffering Servant of Isaiah say that this Servant is like a lamb taken to the slaughter without complaint, bearing the sins of many.
Jesus Christ is the new and perfect Lamb of God because he offered himself as an expiatory sacrifice for the sins of the entire world, like the obedient lamb who goes willingly to his own slaughter; no wonder he is crucified at precisely the time the Passover lambs were being slain and none of his bones were broken on the cross just as no bone of the Passover lamb was to be broken. The new sacrifice is now the Eucharist in which Jesus gives himself to us in his Word and his own Body so that we become like him!