'Tradition of the Elders' in the Bible

Wherefore do thy disciples pass by the tradition of the elders? for they wash not their hands when they eat bread.

(For the Pharisees, and all the Jews, except they vigorously wash hands, eat not, holding the tradition of the elders.

Then the Pharisees and scribes asked him, Wherefore do not thy disciples according to the tradition of the elders, but eat bread with unwashed hands?