Matthew 5:29-30
And if your right eye is what ensnares you into falling away [from God], gouge it out and throw it away from you. For it would be better for you to lose a part of your body than for your whole body to be thrown into hell. [Note: This is the word "Gehenna," and because of its Old Testament connotation of burning bodies, II Chron. 33:6, it is used figuratively here, and elsewhere, to describe the place of future, final punishment of the wicked].
Matthew 18:8-9
If your hand or your foot becomes the occasion for you falling away [from God], cut them off and throw them away. It would be better for you to enter [never ending] life disabled or crippled, rather than keeping both hands and both feet and being thrown into the never ending fire [i.e., because they caused you to fall away from God].