'Unwashed Hands' 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 defile and dishonor the man; but eating with [ceremonially] unwashed hands does not defile the man.”

They had observed some of His disciples eating their food with contaminated, that is, [ceremonially] unwashed hands.

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