Luke 11:18
The woe to the Pharisees at the dinner table begins one of the most sustained confrontations in Luke's Gospel: Jesus does not wash before dinner, and the Pharisee's surprise triggers the first woe — you Pharisees clean the outside of the cup and dish, but inside you are full of greed and wickedness. Give what is inside as alms, and everything will be clean for you — the purity required is internal charity, not external washing.