Matthew 18:6

18:6 but whoever causes one of these little ones who believe in me to stumble, it would be better for him that a huge millstone should be hung around his neck, and that he should be sunk in the depths of the sea.
-World English Bible

Other Translation

18:6 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.
-King James Version