Mark 7:2-4

2 they saw that some of his disciples ate with hands defiled, that is, unwashed.

3 (For the Pharisees, and all the Jews, do not eat unless they wash their hands, observing the tradition of the elders;

4 and when they come from the market place, they do not eat unless they purify themselves; and there are many other traditions which they observe, the washing of cups and pots and vessels of bronze.)