Interestingly while we read of sacrifices shortly after the fall (the source of the skins), sacrifices of Cain and Abel, sacrifices of Noah, and sacrifices of Abraham, Isaac, and Jacob, there was one factor that was not mentioned until the Mosaic code: not breaking a bone!
This command is mentioned twice in the Mosaic Code, and then in Psalms:
He keepeth all his bones: not one of them is broken.
Psalms 34:20
Then we finally see a New Testament fulfillment!
For these things were done, that the scripture should be fulfilled, A bone of him shall not be broken.
John 19:36
Dispensationalism and the Law 