The Catechism in Questions & Answers

138. What is Jesus’ position on the Law of Moses?

The Mosaic Law was of the highest binding authority for the people of Israel. Its fulfilment was considered a prerequisite for the proper relationship between human beings and God. Jesus made it clear that He possessed greater authority than Moses, and that He was Lord over the Law. He summarised the Law into the single commandment to love God above all things, and one’s neighbour as oneself (cf. Matthew 22: 37-40).

“Do not think that I came to destroy the Law or the Prophets. I did not come to destroy but to fulfil.”
Matthew 5: 17
“Jesus said to him, ‘You shall love the Lord your God with all your heart, with all your soul, and with all your mind’ (Deuteronomy 6: 5). This is the first and great commandment. And the second is like it: ‘You shall love your neighbour as yourself’ (Leviticus 19 18). On these two commandments hang all the Law and the Prophets.”
Matthew 22: 37-40