Mark 7:2-4

2 and saw that some of his talmidim ate with ritually unclean hands, that is, without doing n'tilat-yadayim.

3 (For the P'rushim, and indeed all the Judeans, holding fast to the Tradition of the Elders, do not eat unless they have given their hands a ceremonial washing.

4 Also, when they come from the marketplace they do not eat unless they have rinsed their hands up to the wrist; and they adhere to many other traditions, such as washing cups, pots and bronze vessels.)