Matthew 18:6 in the World English Bible
but whoever causes one of these little ones who believe in me to stumble, it would be better for him if a huge millstone were hung around his neck and that he were sunk in the depths of the sea.
Context
5 And whoso shall receive one such little child in my name receiveth me.
6 But whoso shall offend one of these little ones which believe in me, it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea.
7 Woe unto the world because of offences! for it must needs be that offences come; but woe to that man by whom the offence cometh!