Jesus has already stated that the purpose of his ministry was in no way to destroy the Law and the prophets (that is, the Old Testament) but to fulfill them.
In this passage he begins to flesh out what that means. He seeks to bring the Old Testament law and teaching into its fulfillment by expounding its inner intent and purpose for the people of his own day. In “fulfilling” the law, he fills it up with meaning, demonstrating how it reveals to us the will and purpose of God.
I often speak or write — or think — about the mission of the Church. It is natural for religious professionals (or even former ones like me) to get in the habit of thinking that the mission of Christ is the mission of the Church. We start to think of the Church as the necessary mediator of the grace of God — as not just the ordinances of the Church but also its very activities as saving. I think it’s a false teaching, myself — but one easily fallen into — to restrict the activity of God to the activity of the Church — and to (unconsciously) fall into the falsehood of thinking the Church is the necessary mediator of grace.
There is, in fact, a mission of God larger than the Church — out of which the Church was born as a response. The Church did not create this mission and the Church does not own it. It belongs to God. Jesus came into the world as the living expression of the mission of God in the world. The Spirit of God was given to empower the Church in its witness to Christ.
I have reproduced this from the Commentary on Leviticus written by Dr. Daniel Steele (1824-1914) in Whedon’s Commentary on the Old Testament. This was originally published in 1891.
(1.) The verdict of Jehovah against chattelism, and in favor of freedom as the natural inheritance of all men, is found in the sentence of capital punishment inflicted on him who steals and sells a man, or retains him in his hand. Exodus 21:16. This statute lays the axe at the very root of chattel slavery by destroying its very germ, “the wild and guilty phantasy of property in man.” For both stealing and selling assume the fact of a property value. It is to be observed that this law is universal. Stealing a man is a crime. Exodus 21:7, is not a limitation of this universal prohibition to persons of Hebrew blood. The toleration and regulation of the system of servitude in Mosaism are by no means an endorsement of its abstract rightfulness, but rather a concession to the depravity of the times. “Servitude existed before Moses. It was no part of the mission of the Hebrew code to create it. Let it be forever admitted that the laws given of God through Moses cannot be held responsible for its existence. They found it existing, and proceeded, therefore, to modifyit; to soften its more rigid features; to extract its carnivorous teeth; to ordain that the slave had rights which the master and the nation were bound to respect — in short, to tone down the severities of the system from unendurable slavery to very tolerable servitude.” — Cowles.