{10} And whosoever shall offend one of these little ones that believe in me, it is better for him that a millstone were hanged about his neck, and he were cast into the sea.

(10) God is such a severe avenger of offences that it is better to suffer anything else than to be an occasion of offence to any.

People's New Testament

9:42 Whosoever shall offend one of these little ones, etc. See notes on Mt 18:6-10.

Wesley's Notes

9:42 On the contrary, whosoever shall offend the very least Christian. Mt 18:6; Lu 17:1.

Jamieson-Fausset-Brown Bible Commentary

42. For whosoever shall offend one of these little ones that believe in me-or, shall cause them to stumble; referring probably to the effect which such unsavory disputes as they had held would have upon the inquiring and hopeful who came in contact with them, leading to the belief that after all they were no better than others.

it is better for him that a millstone were hanged about his neck-The word here is simply "millstone," without expressing of which kind. But in Mt 18:6 it is the "ass-turned" kind, far heavier than the small hand-mill turned by female slaves, as in Lu 17:35. It is of course the same which is meant here.

and he were cast into the sea-meaning, that if by such a death that stumbling were prevented, and so its eternal consequences averted, it would be a happy thing for them. Here follows a striking verse in Mt 18:7, "Woe unto the world because of offences!" (There will be stumblings and falls and loss of souls enough from the world's treatment of disciples, without any addition from you: dreadful will be its doom in consequence; see that ye share not in it). "For it must needs be that offences come; but woe to that man by whom the offence cometh!" (The struggle between light and darkness will inevitably cause stumblings, but not less guilty is he who wilfully makes any to stumble).

Matthew Henry's Concise Commentary

9:41-50 It is repeatedly said of the wicked, Their worm dieth not, as well as, The fire is never quenched. Doubtless, remorse of conscience and keen self-reflection are this never-dying worm. Surely it is beyond compare better to undergo all possible pain, hardship, and self-denial here, and to be happy for ever hereafter, than to enjoy all kinds of worldly pleasure for a season, and to be miserable for ever. Like the sacrifices, we must be salted with salt; our corrupt affections must be subdued and mortified by the Holy Spirit. Those that have the salt of grace, must show they have a living principle of grace in their hearts, which works out corrupt dispositions in the soul that would offend God, or our own consciences.