11:37-38 Many of Jesus' teaching opportunities arose during meals (cf. 14:1-24; Matt. 15:1-20; 23:1-36; Mark 7:1-22). This was one such situation. Jesus offended His host by not washing ritually before eating. Luke omitted an explanation of the Jewish custom (cf. Matt. 15:1-9; Mark 7:1-4) and only recorded the reason for the Pharisee's objection. The Mosaic Law did not demand this washing (Gr. baptizo), but it had become customary and the Pharisees viewed it as a safeguard against defilement.
11:39-40 Jesus did not criticize this Pharisee and his religious brethren for washing their hands before eating or for observing ritual purification beyond what the law required. He used His host's objection as an occasion to point out the hypocrisy involved in Pharisaic teaching and practice. The Pharisees typically neglected more important things while stressing the necessity of much less important things (cf. 6:27-36; 10:25-37). By washing ceremonially they were only doing half of what God expected of them. They needed to purify themselves internally as well as externally. To wash the outside of a person and not cleanse the inside is as foolish as only washing the outside of a bowl without washing the inside.
"Did not he (the potter or God) who made the outside also make the inside (and therefore you must cleanse both)?"294
11:41 Jesus' point was that giving to the poor would demonstrate that the person had cleansed himself inwardly and adequately. He may have been continuing the metaphor and speaking of a dish or vessel, which the NIV has supplied, but He was thinking of a person. He may have meant that the Pharisees should give food as an act of charity, but the giving of what was theirs was the important thing.