Mark 9:28

And when he had come into the house, his disciples asked him privately, Why could not we cast him out?

Mark 7:17

And when he had entered into the house from the people, his disciples asked him concerning the parable.

Matthew 13:10

And the disciples came, and said to him, Why speakest thou to them in parables?

Matthew 13:36

Then Jesus sent the multitude away, and went into the house: and his disciples came to him, saying, Declare to us the parable of the tares of the field.

Matthew 15:15

Then answered Peter and said to him, Declare to us this parable.

Matthew 17:19-20

Then came the disciples to Jesus apart, and said, Why could not we cast him out?

Mark 4:10

And when he was alone, they that were about him, with the twelve, asked of him the parable.

Mark 4:34

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

Treasury of Scripture Knowledge

Summary

And when he was come into the house, his disciples asked him privately, Why could not we cast him out?

Bible References

Asked

Mark 4:10
And when he was alone, they that were about him, with the twelve, asked of him the parable.
Matthew 13:10
And the disciples came, and said to him, Why speakest thou to them in parables?
Matthew 15:15
Then answered Peter and said to him, Declare to us this parable.

Why

Matthew 17:19
Then came the disciples to Jesus apart, and said, Why could not we cast him out?

General references

2 Kings 20:10
And Hezekiah answered, It is a light thing for the shadow to go forward ten degrees: no, but let the shadow return backward ten degrees.
Matthew 17:19
Then came the disciples to Jesus apart, and said, Why could not we cast him out?
Mark 10:10
And in the house his disciples asked him again of the same matter.