Luke 11:38

The Pharisee was astonished to see that he had not washed before the meal,

"Why do your disciples transgress the tradition of the elders? They do not wash their hands when they take their food."

They noticed that some of his disciples ate their food with 'common' (that is, unwashed) hands.

Now a dispute arose between John's disciples and a Jew over the question of 'purification';

Treasury of Scripture Knowledge

And when the Pharisee saw it, he marvelled that he had not first washed before dinner.

"Why do your disciples transgress the tradition of the elders? They do not wash their hands when they take their food."

They noticed that some of his disciples ate their food with 'common' (that is, unwashed) hands.

Now a dispute arose between John's disciples and a Jew over the question of 'purification';