Jamieson, Fausset and Brown on Matthew 9:12

12. But when Jesus heard that, he said unto them--to the Pharisees and scribes; addressing Himself to them, though they had shrunk from addressing Him.

They that be whole need not a physician, but they that are sick--that is, "Ye deem yourselves whole; My mission, therefore, is not to you: The physician's business is with the sick; therefore eat I with publicans and sinners." Oh, what myriads of broken hearts, of sin-sick souls, have been bound up by this matchless saying!