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?”
Context
25When Jesus saw that the people came running together, he rebuked the foul spirit, saying unto him, dumb and deaf spirit, I charge thee, come out of him, and enter no more into him.
26And cried, and rent him sore, and came out of him: and he was as one dead; insomuch that many said, He is dead.
27But Jesus took him by the hand, and lifted him up; and he arose.
28And when he was come into the house, his disciples asked him privately, Why could not we cast him out?
29And he said unto them, This kind can come forth by nothing, but by prayer and fasting.
30And they departed thence, and passed through Galilee; and he would not that any man should know
31For he taught his disciples, and said unto them, The Son of man is delivered into the hands of men, and they shall kill him; and after that he is killed, he shall rise the third day.