3rd Nephi 15:1-9
And now it came to pass that when Jesus had ended these sayings he cast his eyes round about on the multitude, and saith unto them: Behold, ye have heard these things which I have taught before I ascended to my Father; therefore, whoso remembereth these sayings of mine and doeth them, him will I raise up at the last day. And it came to pass that when Jesus had said these words he perceived that there were some among them which marveled, and wondered what he would concerning the law of Moses; for they understood not the saying that old things had passed away, and that all things had become knew. And he saith unto them: Marvel not that I said unto you that old things had passed away, and that all things had become new. Behold, I say unto you that the law is fulfilled that was given unto Moses. Behold, I am he that gave the law, and I am he which covenanted with my people Israel; therefore, the law in me is fulfilled, for I have come to fulfill the law; therefore it hath an end. Behold, I do not destroy the prophets, for as many as have not been fulfilled in me, verily I say unto you, shall all be fulfilled. And because I said unto you that old things hath passed away, I do not destroy that which hath been spoken concerning things which is to come. For behold, the covenant which I have made with my people is not all fulfilled; but the law which was given unto Moses hath an end in me. Behold, I am the law, and the light. Look unto me, and endure to the end, and ye shall live; for unto him that endureth to the end, will I give eternal life.
The Law of Moses is complete. We no longer have to worry about all the old way of doing things. Through Christ we no longer have to follow the Law. This is a great thing, in that now we have a much clear way to salvation. That way is through Christ and his teachings.