Mark 9:28

28 When he had come into the house, his disciples asked him privately, "Why couldn't we cast it out?"

Mark 9:28 Meaning and Commentary

Mark 9:28

And when he was come into the house
Perhaps into the man's house whose child he had healed, or into some other in these parts, for the sake both of retirement and refreshment:

his disciples asked him privately, why could not we cast him out?
The nine disciples, who were particularly concerned in this matter, fearing they had lost the power of casting out devils, conferred upon them, inquired of Jesus, when he was alone, why they could not cast the demon out of the child, when they had ejected unclean spirits out of many others; (See Gill on Matthew 17:19).

Mark 9:28 In-Context

26 Having cried out, and convulsed greatly, it came out of him. The boy became like one dead; so much that most of them said, "He is dead."

27 But Jesus took him by the hand, and raised him up; and he arose.

28 When he had come into the house, his disciples asked him privately, "Why couldn't we cast it out?"

29 He said to them, "This kind can come out by nothing, except by prayer and fasting."

30 They went forth from there, and passed through Galilee. He didn't want anyone to know it.