Marcos 9

And he said to them: This kind can go out by nothing, but by prayer and fasting.

Y como él entró en casa, sus discípulos le preguntaron aparte: ¿Por qué nosotros no pudimos echarle fuera?

And when he was come into the house, his disciples asked him privately, Why could not we cast him out?

When he had come into the house, his disciples asked him privately, “Why couldn’t we cast it out?”