Man was connected with God until the first sin. Then in order to get closer to God, you had to do all types of burnt offerings, sacrifices, etc. Jesus was the last sacrifice. "I am the lamb that is slain" because one of the sacrifices was to take a lamb without blemish and kill it. Because of His sacrifice, the sacrifices and rituals weren't needed to be close to God anymore, because Jesus closed the gap between God and man and all it took after that was accepting Jesus and His sacrifice.

The story of Abraham and Issac is a mirror of Jesus's story because God commanded Abraham to sacrifice his ONLY BEGOTTEN SON. Read up on that joint for some interesting stuff!

8:35

http://www.mp3.com/835
http://www.mp3.com/forgottendialect
http://www.mp3.com/atedurdyjive