John 7: 19-20.
Did not Moses give you the law, and yet none of you keepeth the law? Why go ye about to kill Me?
The people answered and said, Thou hast a devil: who goeth about to kill Thee?
Jesus spoke directly to the religious leaders here. He had just told them that He was sinless, and had no unrighteousness in Him because He sought to bring glory not to Himself, but to the Father.
Then He said to them that their revered leader, Moses, had brought them the Law, but that they did not keep the law.
Outrageous! How dare this unknown nobody from Nazareth of Galilee accuse the LEADERS of not keeping the law? They were meticulous to a fault about so many things; the one important thing they missed was to acknowledge their own weakness and sin before God.
Then Jesus added fuel to the fire, asking them why they were seeking to kill Him.
“What are you talking about? You must have a demon in You! Who is seeking to kill You? You’re CRAZY!”
He was sinless, and none of them kept the law. No one could keep the entire Law the entire time. That’s why we needed a Savior!
The people didn’t know that the leaders wanted to kill Him because He had healed a man on the Sabbath. Of course, almost every word He said from that point onward just added fuel to their fire. So they used an accusation that we still use today when we disagree with someone: You’re nuts! Crazy as a loon!
They knew He wasn’t crazy. They also knew He was a threat to their power over the people.