Sero - the Old Testament laws need to be interpreted in light of scriptures such as the following:
Hosea 6:6:
For I desire mercy, not sacrifice, and acknowledgment of God rather than burnt offerings
Mark 2: 23-27:
23 One Sabbath Jesus was going through the grainfields, and as his disciples walked along, they began to pick some heads of grain. 24 The Pharisees said to him, "Look, why are they doing what is unlawful on the Sabbath?"
25 He answered, "Have you never read what David did when he and his companions were hungry and in need? 26 In the days of Abiathar the high priest, he entered the house of God and ate the consecrated bread, which is lawful only for priests to eat. And he also gave some to his companions."
27 Then he said to them, "The Sabbath was made for man, not man for the Sabbath. 28 So the Son of Man is Lord even of the Sabbath.
The Pharisees had serious problems with Jesus' teachings, NOT because they were wrong, BUT because he taught in light of scriptures such as the one in Hosea above. They totally missed or possibly even chose to ignore his point. If people want to stick rigidly to the written letter, they are free to do so, likewise, if they choose to interpret those written letters in the light of Jesus'/the Holy Spirit's teaching, they are equally free to do so - neither way is wrong or against the Law (sorry, a difficult concept to wrap your head around maybe!) - read Romans chapters 2-6
Finally, to complement the above!
2 Corinthians 3:
4 Such confidence as this is ours through Christ before God. 5 Not that we are competent in ourselves to claim anything for ourselves, but our competence comes from God. 6 He has made us competent as ministers of a new covenant—not of the letter but of the Spirit; for the letter kills, but the Spirit gives life
Sorry for dragging you off on a Bible study!