Matthew 15:2, the Pharisees quarrelled with the disciples upon this account; here this Pharisee is offended at Christ himself. Mark gives us the reason of it, Mark 7:3, For the Pharisees, and all the Jews, except they wash their hands oft, eat not, holding the tradition of the elders. Concerning this tradition of theirs, and the ground of it, See Poole on "Matthew 15:2", See Poole on "Mark 7:3". We would all be infallible, and therefore cannot allow others to differ from us in a rite, which hath no foundation in God's word, and wonder at those who cannot see with our eyes, nor practise according to our latitudes.
Related Commentaries of Luke 11:38
Luke 11:38
38 And when the Pharisee saw it, he marvelled that he had not first washed before dinner.