Jesus did not come to earth to abolish the laws of the Old Testament, but to fulfil them. The New Testament sheds new light on the Old Testament. Some Biblical laws no longer apply because Jesus has given us a higher law which is based on loving your neighbour. Jesus tells us, for instance, that loving our enemies is better than seeking revenge when something bad happens to us.
Other laws, such as the Ten Commandments, are still valid. The Church, guided by the Holy Spirit, helps us to realise which laws still apply to us and which do not.
