Mishkat al-Masabih 3453

Abu Huraira reported God’s Messenger as saying, “He who throws himself from a mountain and kills himself will be thrown down in the fire of jahannam and remain in it for ever and ever; he who sips poison and kills himself will have his poison in his hand and sip it for ever and ever in the fire of jahannam; and he who kills himself with a piece of iron will have his piece of iron in his hand and will be stabbed with it in his belly in the fire of jahannam for ever and ever.” (Bukhari and Muslim.)