They noticed that some of his disciples were eating their food with hands that were ritually unclean---that is, they had not washed them in the way the Pharisees said people should.
(For the Pharisees, as well as the rest of the Jews, follow the teaching they received from their ancestors: they do not eat unless they wash their hands in the proper way;
nor do they eat anything that comes from the market unless they wash it first. And they follow many other rules which they have received, such as the proper way to wash cups, pots, copper bowls, and beds. )
So the Pharisees and the teachers of the Law asked Jesus, "Why is it that your disciples do not follow the teaching handed down by our ancestors, but instead eat with ritually unclean hands?"
Jesus answered them, "How right Isaiah was when he prophesied about you! You are hypocrites, just as he wrote: 'These people, says God, honor me with their words, but their heart is really far away from me.
"You are no more intelligent than the others," Jesus said to them. "Don't you understand? Nothing that goes into you from the outside can really make you unclean,
because it does not go into your heart but into your stomach and then goes on out of the body." (In saying this, Jesus declared that all foods are fit to be eaten.)
Then Jesus left and went away to the territory near the city of Tyre. He went into a house and did not want anyone to know he was there, but he could not stay hidden.