Matthew 17:19

Afterward, when he was alone, the disciples went to Jesus and said to him, "Why could we not drive it out?"

Mark 4:10

When he was by himself, those who stayed about him with the Twelve asked him about the figures he had used.

Mark 9:28

When he had gone home, and his disciples were alone with him, they asked him, "Why could not we drive it out?"

Treasury of Scripture Knowledge

Summary

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

General references

Bible References

General references

Mark 4:10
When he was by himself, those who stayed about him with the Twelve asked him about the figures he had used.
Mark 9:28
When he had gone home, and his disciples were alone with him, they asked him, "Why could not we drive it out?"