Mark 7:2
And saw some of his disciples eating food with hands that were defiled, that is, unwashed — the observation that triggers the controversy is dietary-ritual: the disciples are eating without washing their hands in the prescribed manner. The that is, unwashed is Mark's explanatory aside, communicating that he is writing for a Gentile audience unfamiliar with Jewish purity practices. The offense is not hygienic (unsanitary hands) but ritual: the Pharisaic tradition required handwashing before meals as an extension of the priestly purity requirements into everyday life.