New Revised Standard Version
And I brought him to your disciples, but they could not cure him.”

Contemporary English Version
I brought him to your disciples, but none of them could heal him."

New American Bible
I brought him to your disciples, but they could not cure him.”

Douay-Rheims Bible
Then Jesus answered and said: O unbelieving and perverse generation, how long shall I be with you? How long shall I suffer you? Bring him hither to me.

Then Jesus answered and said: O unbelieving and perverse generation, how long shall I be with you? How long shall I suffer you? Bring him hither to me.

and they.

Matthew 17:19,20 Jesus said to them: Because of your unbelief. For, amen I say to you, if you have faith as a grain of mustard seed, you shall say to this mountain: Remove from hence hither, and it shall remove: and nothing shall be impossible to you. . . .

2 Kings 4:29-31 Then he said to Giezi: Gird up thy loins, and take my staff in thy hand, and go. If any man meet thee, salute him not: and if any man salute thee, answer him not: and lay my staff upon the face of the child. . . .

Luke 9:40 And I desired thy disciples to cast him out: and they could not.

Acts 3:16 And in the faith of his name, this man, whom you have seen and known, hath his name strengthened. And the faith which is by him hath given this perfect soundness in the sight of you all.

Acts 19:15,16 But the wicked spirit, answering, said to them: Jesus I know: and Paul I know. But who are you? . . .