Mark 4:34

but, without a parable, was he not speaking unto them, - privately, however, unto his own disciples, was he explaining all things.

John 16:25

These things, in similitudes, have I spoken unto you: There cometh an hour, when, no longer in similitudes, will I speak unto you, but, openly, concerning the Father, will I tell you.

Matthew 13:36-43

Then, dismissing the multitudes, he went into the house, and his disciples came near to him, saying - Make quite plain to us the parable of the darnel of the field.

Matthew 15:15-20

And Peter, answering, said unto him, Declare to us the parable.

Mark 4:10

And when he was alone they who were about him with the twelve questioned him as to the parables;

Luke 24:27

And, beginning from Moses, and from all the prophets, he thoroughly explained to them, in all the Scriptures, the things concerning himself.

Mark 7:17-23

And, when he entered into a house from the multitudes, his disciples began to question him as to the parable;

Luke 8:9-10

But his disciples began to question him - What might, this very, parable be?

Luke 24:44-46

And he said unto them - These, are my words, which I spake unto you yet being with you: That all the things that are written in the law of Moses and the Prophets and Psalms, concerning me, must needs be fulfilled.

Treasury of Scripture Knowledge

Summary

But without a parable spake he not unto them: and when they were alone, he expounded all things to his disciples.

Bible References

When

Mark 4:10
And when he was alone they who were about him with the twelve questioned him as to the parables;
Mark 7:17
And, when he entered into a house from the multitudes, his disciples began to question him as to the parable;
Matthew 13:36
Then, dismissing the multitudes, he went into the house, and his disciples came near to him, saying - Make quite plain to us the parable of the darnel of the field.
Matthew 15:15
And Peter, answering, said unto him, Declare to us the parable.
Luke 8:9
But his disciples began to question him - What might, this very, parable be?
Luke 24:27
And, beginning from Moses, and from all the prophets, he thoroughly explained to them, in all the Scriptures, the things concerning himself.

General references

Ezekiel 17:2
Son of man Put thou forth a riddle And speak thou a parable,- Unto the house of Israel:
Matthew 13:34
All these things, spake Jesus in parables, unto the multitudes, and, without a parable, was he speaking, nothing, unto them:
Matthew 22:1
And, answering, Jesus, again, spake in parables unto them, saying: -
Mark 4:10
And when he was alone they who were about him with the twelve questioned him as to the parables;
Mark 7:17
And, when he entered into a house from the multitudes, his disciples began to question him as to the parable;