Mattityahu 18:6-9

But whoever causes a michshol (stumbling block) for one of these little ones, who have emunah in me, it is better for him that a heavy millstone be hung around his neck, and that he be drowned in the depth of the sea. Oy lOlam (Woe to the World) because of its michsholim (stumbling blocks)! For it is inevitable that michsholim come; but oy to that man through whom the michshol comes. And if your hand or your foot causes a michshol for you, cut it off, and throw it from you. It is better for you to enter Chayyim crippled or as one of the pisechim (lame), than, having two hands and two feet, to be cast into the Eish Olam (Eternal Fire). And if your eye causes a michshol for you, pluck it out and throw it from you. It is better for you to enter Chayyim one-eyed than, having two eyes, to be cast into the Gehinnom HaEish.