Luke 20:3

"I will also ask you a question," he replied.

"Why do your disciples keep transgressing the tradition of the elders by not washing their hands before eating?"

"And if I ask you, you will not answer.

Let your speech be always gracious, with a savor of salt, and learn how to give every man a fitting answer.

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.