Matthew 17:19

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

Mark 4:10

As soon as He was alone, those who were around Him, together with the twelve [disciples], began asking Him about [the interpretation of] the parables.

Mark 9:28

When He had gone indoors, His disciples began asking Him privately, “Why were we unable to drive it out?”

Treasury of Scripture Knowledge

Summary

Matthew 17:19

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

General references

Mark 4:10

Mark 9:28

Bible References

General references

As soon as He was alone, those who were around Him, together with the twelve [disciples], began asking Him about [the interpretation of] the parables.

When He had gone indoors, His disciples began asking Him privately, “Why were we unable to drive it out?”