Thou blind Pharisee,.... Well might Christ call such an one a blind Pharisee, who was so scrupulously careful to cleanse his cup and platter; and yet made no conscience of filling them with what was gotten in an unjust way, and so defiled himself and them:

cleanse first that which is within the cup and platter, that the outside of them may be clean also: get food and drink in an honest way, remove all extortion and oppression out of thine hands, and luxury and intemperance from thy table; and so shall the outward cleanness of thy cup and dish, be no reproach unto thee, or testimony against thee, of thine hypocrisy. So the great concern of all men should be, inward purity; that their hearts be purified by faith in the blood of Christ, and sprinkled from an evil conscience by the same; that principles of grace and holiness be formed in them by the Spirit of God; and then their outward lives and conversations being influenced thereby, will be honourable and agreeable to their professions. Otherwise, an external reformation, or an outward show of holiness, and bare pretensions to it, without internal grace, will never be of any avail in the sight of God.

within they are full of extortion--In Luke (Luk 11:39) the same word is rendered "ravening," that is, "rapacity."