Mark 9:28

Overview - Mark 9
1	Jesus is transfigured.
11	He instructs his disciples concerning the coming of Elias;
14	casts forth a deaf and dumb spirit;
30	foretells his death and resurrection;
33	exhorts his disciples to humility;
38	bidding them not to prohibit such as are not against them, nor to give offence to any of the faithful.

Mark 9:28  (King James Version)
And when he was come into the house, his disciples asked him privately, Why could not we cast him out?