Mark 9:28

28Andκαὶhaving enteredεἰσελθόντοςHeαὐτοῦintoεἰςa houseοἶκονtheοἱdisciplesμαθηταὶof Himαὐτοῦinκατ’privateἰδίανwere askingἐπηρώτωνHimαὐτόν·WhyὍτιweἡμεῖςnotοὐκwere ableἠδυνήθημενto cast outἐκβαλεῖνitαὐτό;

And [on] His having entered into the house, His disciples were questioning Him by Himself, “Why were we not able to cast it out?”