When many Mormons read their Israelite scriptures their approach is that of western protestant Christianity that is based upon a Greek-Gentile Mindset and culture. So I thought I would post a scripture from the Book of Mormon and read it with Hebrew Eyes to demonstrate how we would read and interpret these words in light of our language, background, and culture.
(3 Nephi 154)
2 And it came to pass that when Jesus had said these words he perceived that there were some among them who 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 new.
3 And he said unto them: Marvel not that I said unto you that old things had passed away, and that all things had become new.
4 Behold, I say unto you that the law is fulfilled that was given unto Moses.
5 Behold, I am he that gave the law, and I am he who covenanted with my people Israel; therefore, the law in me is fulfilled, for I have come to fulfil the law; therefore it hath an end.
6 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.
7 And because I said unto you that old things have passed away, I do not destroy that which hath been spoken concerning things which are to come.
8 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.
Verse 2-3: Old and New-- The word for new finds its root in the Hebrew word Chodesh. The word Chodesh that is translated "new" relates to the idea of the NEW MOON. It draws upon the picture of a cycle. The moon goes through its phases from Dark to light to back to darkness. What we call the New moon is actually a RE-NEWAL OF THE MOON every month. So for old things to become new in a Hebrew concept draws from the idea of a cycle of birth-maturity-death and then birth again, but in the end while we call it a "new moon" it is actually the same MOON Reborn. The Law God gave to Moses had its birth and through the applying of traditions and apostasy it matured and waned but through the Messiah it is re-newed just as our Moon is renewed every month. Same law in its original state and intent or as Mormons might understand it-- IT WAS RESTORED.
4-5 Fulfilled- From a Gentile point of view fulfilled means it literally has an end, i.e so we don't have to follow it anymore. As such that means I get to worship other Gods, disrespect my parents, steal, murder, and sleep with your wife, etc as the law is fulfilled and done away. To FULFILL the Torah to a Jew means to PROPERLY INTERPRET AND PERFORM THE TORAH. So when the Messiah says he comes to FULFILL the LAW he means that he comes to give us the correct Interpretation and performance of the commandments he gave to Moses at Sinai.
The part that trips us up is the "it hath an end" part. Hebraic thought is rooted in cycles-- what we in the LDS world might call an eternal round. In Greek culture and though to have an end is similar to the idea of crossing the finish line in a race-- it is done and you finished the race. In Hebraic thought "the end" is the purpose for which something is Given. Hebrew is rooted in function. Like a cycle of the Moon we go through a cycle but in the end it is still the same moon. To accomplish the "end" of something is to accomplish it's purpose. The section of scripture above is part of a poetic structure and if you will notice the Messiah himself tells you what the end or purpose of the law, "but the law which was given unto Moses hath an end in me." In other words the law given to Moses is to bring us to the Messiah. That is it's purpose. There is one path, one way, one Messiah.