Matthew 17:19

then came the disciples to Jesus in private, and said, why could not we cast him out?

And when he was in private, the twelve, and some of his disciples asked him the meaning of the parable.

now when Jesus was retired to his own house, his disciples asked him in private, why could not we cast this spirit out?

Treasury of Scripture Knowledge

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

And when he was in private, the twelve, and some of his disciples asked him the meaning of the parable.

now when Jesus was retired to his own house, his disciples asked him in private, why could not we cast this spirit out?