I have heard it said a number of times that Christ gave us a new law, or a different law. Sometimes it is also expressed as Christ's expansion of the law. The sermon on the mount is often given as the example of Christ doing this. This is not the case however. Christ was not giving us new law, nor was he replacing the old law. What he was doing was explaining the fullness of the old law. I think that we can see this if we take seriously Christ's words in Matthew 5 and then meditate on the law of God received at Sinai.
