Luke 20:3

And he answered and said unto them, I also will ask you a question; and tell me:

Why do thy disciples transgress the tradition of the elders? for they wash not their hands when they eat bread.

and if I ask you , ye will not answer.

Let your speech be always with grace, seasoned with salt, that ye may know how ye 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 , ye will not answer.