Luke 20:3

He answered them, "I also will ask you a question; now tell me,

"Why do your disciples transgress the tradition of the elders? For they do not wash their hands when they eat."

And if I ask you, you will not answer.

Let your speech always be full of grace, seasoned with salt, so that you may know how you ought to answer everyone.

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.