Matthew 5:17-20 typically is used to frame the interpretation of 21-48 in light of fulfillment. Fulfillment as in revealing the laws original intent and satisfying those demands. It is an argument typically used to drive a Moral continuity between Jesus' claims and the Old Testament Mosaic Law...
I was listening to a lesson on Covenant Theology this morning, Dr. Stephen Myers spoke of the CoW with Adam and also mentioned the creation ordinances, which was the first I had ever heard them referred to as such!
Concerning the ordinances of procreation and marriage... how do they coincide...