Matthew 13:10
And the disciples having come near, said to him, 'Wherefore in similes dost thou speak to them?'
Mark 4:10
And when he was alone, those about him, with the twelve, did ask him of the simile,
Mark 4:33-34
And with many such similes he was speaking to them the word, 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?