Mark 9:28

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

Mark 7:17

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

Matthew 13:10

Then the disciples came and said unto him, Why dost thou speak unto them in parables?

Matthew 13:36

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

Matthew 15:15

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

Matthew 17:19-20

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

Mark 4:10

And when he was alone, those that were close to him with the twelve asked of him the parable.

Mark 4:34

But without a parable he did not speak unto 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, those that were close to him with the twelve asked of him the parable.
Matthew 13:10
Then the disciples came and said unto him, Why dost thou speak unto them in parables?
Matthew 15:15
Then Peter answered and said unto him, Declare unto us this parable.

Why

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

General references

2 Kings 20:10
And Hezekiah answered, It is an easy thing for the shadow to go down ten degrees, but not for the shadow to return backward ten degrees.
Matthew 17:19
Then the disciples came 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.