Who is the Lamb of God slain at the founding of the world?

Question:

Who is the Lamb of God slain at the founding of the world?

If Jesus was the Lamb of God slain at the founding of the world then the world started 2006 years ago. If you use the bible I want to see Lamb and Jesus in the same scripture.
Otherwise try to put it together.

Best Answer - Chosen by Asker: John 1:29 The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.
John 1:36 And looking upon Jesus as he walked, he saith, Behold the Lamb of God!

Other references:
Rev. 5:6; 7:17; 14:10; 15:3; Rev. 19:9; 21:21,22; 22:1,3

The world is billions of years old but mankind has only been here for about 6,000 years.