Matthew 5:17-18 (Amplified Bible)
"17 Do not think that I have come to do away with or undo the Law or the Prophets; I have come not to do away with or undo but to complete and fulfill them. 18 For truly I tell you, until the sky and earth pass away and perish, not one smallest letter nor one little hook [identifying certain Hebrew letters] will pass from the Law until all things [it foreshadows] are accomplished. 19 Whoever then breaks or does away with or relaxes one of the least [important] of these commandments and teaches men so shall be called least [important] in the kingdom of heaven, but he who practices them and teaches others to do so shall be called great in the kingdom of heaven. 20 For I tell you, unless your righteousness (your uprightness and your right standing with God) is more than that of the scribes and Pharisees, you will never enter the kingdom of heaven.
It's saying nothing will get by the law until everything it foreshadows is accomplished, which is Christ and bringing people to Him.
Which is why we can't erase it; we can't act like sin is not sin because without Christ people will be judged by it, and without recognizing it a person can't really come to Christ.