Matthew 9:10

And it came to pass as he sat at meat in the house, behold, many publicans and sinners came and sat down with Jesus and his disciples. And when the Pharisees saw it, they said unto his disciples, Why eateth your Teacher with the publicans and sinners? But when he heard it, he said, They that are whole have no need of a physician, but they that are sick.

Regarding the place and make-up of the company that attended the feast mentioned here, see final paragraph under Matthew 9:9 above. Note that the Pharisees, by directing their questions to Jesus' disciples instead of to him, were attempting to open a wedge between them and were trying to inoculate the disciples with their own blind prejudice.

Jesus' rejoinder to the effect that the sick, not the whole. require a physician, was rich in irony. It passed over the fact, known to all, that spiritually the Pharisees themselves were about the sickest people of that generation. Whether the Pharisees got the point or not is not revealed; but it may safely be assumed that if they did not, others did. The whole population was fully acquainted with the greed, cunning, duplicity, and general wickedness of those evil men who sat in Moses' seat. Jesus' remark might well have been the occasion for a roar of laughter.