Mark 9:28

When He came into the house, His disciples began questioning Him privately, “Why could we not drive it out?”

Mark 7:17

When he had left the crowd and entered the house, His disciples questioned Him about the parable.

Matthew 13:10

And the disciples came and said to Him, “Why do You speak to them in parables?”

Matthew 13:36

Then He left the crowds and went into the house. And His disciples came to Him and said, “Explain to us the parable of the tares of the field.”

Matthew 15:15

Peter said to Him, “Explain the parable to us.”

Matthew 17:19-20

Then the disciples came to Jesus privately and said, “Why could we not drive it out?”

Mark 4:10

As soon as He was alone, His followers, along with the twelve, began asking Him about the parables.

Mark 4:34

and He did not speak to them without a parable; but He was explaining everything privately to His own 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
As soon as He was alone, His followers, along with the twelve, began asking Him about the parables.
Matthew 13:10
And the disciples came and said to Him, “Why do You speak to them in parables?”
Matthew 15:15
Peter said to Him, “Explain the parable to us.”

Why

Matthew 17:19
Then the disciples came to Jesus privately and said, “Why could we not drive it out?”

General references

2 Kings 20:10
So Hezekiah answered, “It is easy for the shadow to decline ten steps; no, but let the shadow turn backward ten steps.”
Matthew 17:19
Then the disciples came to Jesus privately and said, “Why could we not drive it out?”
Mark 10:10
In the house the disciples began questioning Him about this again.