And when he was come into the house, his disciples asked him privately, Why could not we cast him out?
Berean Study Bible (BSB) - Mark 9:28 >After Jesus had gone into the house, His disciples asked Him privately, “Why couldn’t we drive it out?”
Textus Receptus (TR) - Mark 9:28 >Καὶ εἰσελθόντα αὐτὸν εἰς οἶκον, οἱ μαθηταὶ αὐτοῦ ἐπηρώτων αὐτὸν κατ᾿ ἰδίαν ὅτι Ἡμεῖς οὐκ ἠδυνήθημεν ἐκβαλεῖν αὐτό;