Matthew 13:10
Then the disciples came up and said to him, "Why do you speak in parables?"
Mark 4:10
When he was by himself his adherents and the twelve asked him about the parable,
Mark 4:33-34
In many a parable like this he spoke the word to them, so far as they could listen to it;
Treasury of Scripture Knowledge
Summary
And the disciples came, and said unto him, Why speakest thou unto them in parables?