Matthew 13:10
And the disciples came up and said to him, Why speakest thou to them in parables?
Mark 4:10
And when he was alone, those about him with the twelve asked him as to the parables.
Mark 4:33-34
And with many such parables he spoke the word to them, as they were able to hear,
Treasury of Scripture Knowledge
Summary
And the disciples came, and said unto him, Why speakest thou unto them in parables?