How does Matthew have Jesus fulfilling law and prophets?

During class it was stated that the key to interpreting Matthew is found at 5:17, “Do not think that I have come to abolish the Law (Torah) or the Prophets (Nebiim). I have come not to abolish but to fulfill.”

1. How does Matthew have Jesus fulfilling law and prophets?

2. What are some of Rabbi Neusner’s objections to Jesus’ Sermon on the Mount?

3. How would Rabbi Neusner answer the question, “if a little lamb fell into a ditch on the Sabbath, should I rescue it? Would this be ‘work’ on the Sabbath?“