A.T. Robertson Commentary Mark 9:19

"And he answereth them and saith, O faithless generation, how long shall I be with you? how long shall I bear with you? bring him unto me." — Mark 9:19 (ASV)

Bring him unto me (φερετε αυτον προς με). The disciples had failed and their unbelief had led to this fiasco. Even the disciples were like and part of the

faithless (απιστος, unbelieving) generation in which they lived. The word

faithless does not here mean treacherous as it does with us. But Jesus is not afraid to undertake this case. We can always come to Jesus when others fail us.