This is a topic that takes a considerable amount of Biblical knowledge to understand. The reason being is that there has been so much confusion spread about this topic.
Jesus did not called the law evil or deny the prophets. Jesus was there when the law was given to Moses on Mt.Sinai and thus is the reason for the law in the first place. The law was given to Israel so that they would keep themselves holy in the eyes of the LORD and be pure enough to fulfill the prophecy of Gen.3:15 that first tells us that the Messiah would be born of a woman. Well, this woman cannot be a whore and prostitution was a violation of the law of Israel and thus the punishment was death to those who had sex before marriage. The reason for this is that God had to be the Father of the manifestation of what would be God in the flesh--Jesus Christ/Yeshua Messiah.
The law was there to preserve the nation that would carry the seed of the Messiah. Jesus came and fulfilled this mission and now we are no longer condemned by the law because Jesus become the curse for our sins. We are saved by our faith, and by this faith we naturally grow in the fruits of the spirit and works come natural; but faith is the seal of salvation sense the Holy Spirit is the sealer(Eph.1:13). The Holy Spirit is the teacher and instructor. The law is still holy, but it no longer has the power to condemn us if we walk in the faith of Christ.
The New Testament covers this issue in greater depth and most people can understand Paul (for the exception of Seventh Day Adventists).
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