Matthew 13:10
And the disciples came, and said unto him, Why do you speak unto them in parables?
Mark 4:10
And when he was alone, they that were about 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?