Jesus begins to speak to the Pharisee using a metaphor. He compares the way they clean cups and bowls to how they clean themselves. (See: [[rc://en/ta/man/translate/figs-metaphor]])
This part of the metaphor contrasts the careful way they clean the outside of the dishes with the way they ignore their own internal condition. (See: [[rc://en/ta/man/translate/figs-metaphor]])