'Unwashed' in the Bible

Why do your disciples go against the teaching of the fathers? for they take food with unwashed hands.

These are the things which make a man unclean; but to take food with unwashed hands does not make a man unclean.

And had seen that some of his disciples took their bread with unclean, that is, unwashed, hands.

And the Pharisees and the scribes put the question to him, Why do your disciples not keep the rules of the fathers, but take their bread with unwashed hands?