Christ fulfilled the law of animal sacrifice. You really think Christ died so you no longer have to love your mother and father, you can murder people, you can steal etc. all of those all laws in the OT. Christ is the perfect lamb that died for our sins. Whenever you sinned in the OT animal sacrifice was required. That's the only thing that's done away.
Acts 20:16 (Paul keeping the feast of Pentecost which is a law in the OT)
Do you keep this feast every year?
For Paul had decided to sail by Ephesus, so that it might not come upon him to spend time in Asia; for he was hastened, if it was possible for him, to be in Jerusalem on the day of Pentecost.
Romans 3:31
Do we then make void the law through faith? God forbid: yea, we establish the law.
Matthew 5:17
Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them, but to fulfill them.
Revelation 14:12
Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
Matthew 5:17-22King James Version (KJV)
17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
20 For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.
21 Ye have heard that it was said of them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:
22 But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.