Mark 7:2-4

2 They saw that some of Jesus' followers ate food with hands that were not clean, that is, they hadn't washed them.

3 (The Pharisees and all the Jews never eat before washing their hands in a special way according to their unwritten laws.

4 And when they buy something in the market, they never eat it until they wash themselves in a special way. They also follow many other unwritten laws, such as the washing of cups, pitchers, and pots.)