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