Mark 9:42 in the King James Version
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.
Context
41 For whoever will give you a cup of water to drink in my name because you are Christ’s, most certainly I tell you, he will in no way lose his reward.
42 “Whoever will cause one of these little ones who believe in me to stumble, it would be better for him if he were thrown into the sea with a millstone hung around his neck.
43 If your hand causes you to stumble, cut it off. It is better for you to enter into life maimed, rather than having your two hands to go into Gehenna, into the unquenchable fire,