John Mark
Mark 9:43ESV·traditional attribution

And if your hand causes you to sin, cut it off. It is better for you to enter life crippled than with two hands to go to hell, to the unquenchable fire.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. Christ promiseth a reward to all those that are any way kind to his disciples (Mar 9:41); "Whosoever shall give you a cup of water, when you need it, and will be a refreshment to you, because ye belong to Christ, and are of his family, he shall not lose his reward." Note, 1.

Commenting on Mark 9:41-50

John Gill Reformed Baptist @doctorgill

Where their worm dieth not, and the fire is not quenched. The passage referred to, is in Isa 66:24, and as there, the words are spoken of such, as transgressed against the Lord; so here, of such as offended any of Christ's little ones, or were offended by an hand, a foot, or eye, and retained them: by their worm is meant, their conscience; for...

Albert Barnes Presbyterian @notesbybarnes

Verse 43. (w) "And if thine hand" (1) "offend" or, "cause thee to offend"