Mark 9:28

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

Matthew 13:10

Then the disciples came, and said to him, "Why do you speak to them in parables?"

Matthew 13:36

Then Jesus sent the crowds away, and went into the house. His disciples came to him, saying, "Explain to us the parable of the tares in the field."

Matthew 15:15

Peter answered him, "Explain the parable to us."

Matthew 17:19-20

Then the disciples came to Jesus privately, and said, "Why weren't we able to cast it out?"

Mark 4:10

And when he was alone, those who were around him with the twelve asked him about the parables.

Mark 4:34

Without a parable he did not speak to them; but privately to his own disciples he explained everything.

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 who were around him with the twelve asked him about the parables.
Matthew 13:10
Then the disciples came, and said to him, "Why do you speak to them in parables?"
Matthew 15:15
Peter answered him, "Explain the parable to us."

Why

Matthew 17:19
Then the disciples came to Jesus privately, and said, "Why weren't we able to cast it out?"

General references

2 Kings 20:10
Hezekiah answered, "It is a light thing for the shadow to go forward ten steps. Nay, but let the shadow return backward ten steps."
Matthew 17:19
Then the disciples came to Jesus privately, and said, "Why weren't we able to cast it out?"
Mark 10:10
In the house, the disciples asked him again about the same matter.