First, I'm not here for a debate. But Christ is speaking about the 10 Commandments being fulfilled in Matthew 5. The problem with making this the law of Moses is that you force the Scriptures to contradict themselves when you say that. Let me try once more.
Look first at this verse:
Ephesians 2:15 Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace;
This plainly says Jesus abolished the law of commandments contained in ordinances. Now, look at Matthew 5 again.
Matthew 5:17-18 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.
Either the law of commandments contained in ordinances was abolished, or it was not. Ephesians is clear, it says it was. So then it cannot be the law contained in ordinances Jesus was talking about in Matthew 5. If fulfil in this passage means "abolish even the law of commandments contained in ordinances" then Jesus contradicted Himself. "Think not that I am come to destroy the law (defining law here as the law of commandments contained in ordinances), or the prophets: I am not come to destroy, but to abolish the law of commandments contained in ordinances." That is 100% a contradiction. Therefore, first we must not redefine fulfil to mean abolish at the cross. And second, we must realize the law spoken of here, is not the law of commandments contained in ordinances.