Matthew 13:10
And His disciples coming, said to Him; Wherefore do you speak to them in parables?
Mark 4:10
And when they were alone, and those around Him along with the twelve asked Him the parable.
Mark 4:33-34
And in many such parables He continued to speak 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?