Matthew 17:19

Then the disciples having come to Jesus by himself, said, 'Wherefore were we not able to cast him out?'

And when he was alone, those about him, with the twelve, did ask him of the simile,

And he having come into the house, his disciples were questioning him by himself -- 'Why were we not able to cast it forth?'

Treasury of Scripture Knowledge

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

And when he was alone, those about him, with the twelve, did ask him of the simile,

And he having come into the house, his disciples were questioning him by himself -- 'Why were we not able to cast it forth?'