Luke 20:3

Jesus responded: I also will ask you a question. Tell me,

They questioned him: Why do your disciples go against the teaching of the fathers? They eat food with unwashed hands.

and if I ask you, you will not answer.

Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer each one.

Treasury of Scripture Knowledge

And he answered and said unto them, I will also ask you one thing; and answer me:

and if I ask you, you will not answer.