Mark 9:28

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

Mark 7:17

And when he was entered into the house from the multitude, his disciples asked of him the parable.

Matthew 13:10

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

Matthew 13:36

Then he left the multitudes, and went into the house: and his disciples came unto him, saying, Explain unto us the parable of the tares of the field.

Matthew 15:15

And Peter answered and said unto him, Declare unto us the parable.

Matthew 17:19-20

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

Mark 4:10

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

Mark 4:34

and without a parable spake he not unto them: but privately to his own disciples he expounded all things.

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 parables.
Matthew 13:10
And the disciples came, and said unto him, Why speakest thou unto them in parables?
Matthew 15:15
And Peter answered and said unto him, Declare unto us the parable.

Why

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

General references

2 Kings 20:10
And Hezekiah answered, It is a light thing for the shadow to decline ten steps: nay, but let the shadow return backward ten steps.
Matthew 17:19
Then came the disciples to Jesus apart, and said, Why could not we cast it out?
Mark 10:10
And in the house the disciples asked him again of this matter.

American Standard Version Public Domain