John Mark
Mark 9:17ESV·traditional attribution

And someone from the crowd answered him, “Teacher, I brought my son to you, for he has a spirit that makes him mute.

John Calvin Reformed @genevareformer

17. Master, I have brought to thee my son. Matthew describes a different sort of disease from what is described by Mark, for he says that the man was lunatic But both agree as to these two points, that he was dumb, and that at certain intervals he became furious.

Matthew Henry Presbyterian @wholebiblehenry

We have here the story of Christ casting the devil out of a child, somewhat more fully related than it was in Mat 17:14, etc. Observe here, I. Christ's return to his disciples, and the perplexity he found them in. He laid aside his robes of glory, and came to look after his family, and to enquire what was become of them.

Commenting on Mark 9:14-29

John Gill Reformed Baptist @doctorgill

And one of the multitude answered and said,.... The Scribes made no reply, being afraid to engage with him, whom they had often found too hard for them; and the disciples, if they were spoken to, were silent, through shame, because they had not succeeded in the cure of the person brought to them, which gave their enemies an handle against them: wherefore the parent...