Treasury of Scripture Knowledge
Summary
Then came the disciples to Jesus apart, and said, Why could not we cast him out?
Bible References
General references
Mark 4:10
And when He was alone those people who gathered around Him, along with the twelve apostles, asked Him what the parables meant.
Mark 9:28
And when Jesus had come into a house, His disciples asked Him privately, "Why could we not drive out the evil spirit [from that boy]?"