Then Jesus said to them, “This is what I explained to you while I was still with you. Everything written about me in the law of Moses, the prophets, and the psalms, had to be fulfilled.”
The people living in Jerusalem and their leaders didn't recognize Jesus or understand the words spoken by the prophets that are read every Sabbath. In fact they fulfilled the prophetic words by condemning him!
But now God's character of goodness and right has been demonstrated. It has nothing to do with law-keeping, even though it was spoken of by the law and the prophets.