Matthew 13:10
And the disciples, coming near, said to him, Wherefore, in parables, art thou speaking to them?
Mark 4:10
And when he was alone they who were about him with the twelve questioned him as to the parables;
Mark 4:33-34
And, with many such parables as these, was he speaking unto them the word, - according 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?