Mark 9:28

And [after] he had entered into the house, his disciples asked him privately, "Why were we not able to expel it?"

Mark 7:17

And when he entered into the house away from the crowd, his disciples asked him about the parable.

Matthew 13:10

And the disciples came up [and] said to him, "{Why} do you speak to them in parables?"

Matthew 13:36

Then he left the crowds [and] came into the house, and his disciples came to him saying, "Explain the parable of the darnel in the field to us."

Matthew 15:15

But Peter answered [and] said to him, "Explain this parable to us."

Matthew 17:19-20

Then the disciples approached Jesus privately [and] said, {Why} were we not able to expel it?"

Mark 4:10

And when he was alone, those around him together with the twelve began asking him about the parables.

Mark 4:34

And he did not speak to them without a parable, but in private he explained everything 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
And when he was alone, those around him together with the twelve began asking him about the parables.
Matthew 13:10
And the disciples came up [and] said to him, "{Why} do you speak to them in parables?"
Matthew 15:15
But Peter answered [and] said to him, "Explain this parable to us."

Why

Matthew 17:19
Then the disciples approached Jesus privately [and] said, {Why} were we not able to expel it?"

General references

2 Kings 20:10
Hezekiah answered, "It is easy for the shadow to lengthen ten steps. No, but let the shadow return backwards ten steps."
Matthew 17:19
Then the disciples approached Jesus privately [and] said, {Why} were we not able to expel it?"
Mark 10:10
And in the house again the disciples began to ask him about this.