Sayyiduna Thabit bin al-Dahhak (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him): "Whoever falsely swears by a religion other than Islam is as he said; whoever kills himself with something will be punished with that very thing on the Day of Resurrection; and whoever calls a believer a disbeliever or curses him, that is equivalent to killing him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15876
It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever commits suicide with a piece of iron will be given that iron, with which he will tear open his stomach in Hell, and he will keep inflicting this punishment on himself forever. Whoever kills himself with poison will be given poison in Hell, and he will be punished with it forever; and whoever commits suicide by jumping from a mountain will jump in Hell as well, and he will keep doing so in Hell forever."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15877
It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever commits suicide with a piece of iron will be given that iron, with which he will tear open his stomach in Hell, and he will keep inflicting this punishment on himself forever. Whoever kills himself with poison will be given poison in Hell, and he will be punished with it forever; and whoever commits suicide by jumping from a mountain will jump in Hell as well, and he will keep doing so in Hell forever."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15878
Sayyiduna Jundub bin Abdullah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Among the nations before you, a man had a boil appear on his hand; because of its pain he cut his hand, which made the blood flow, and the man died. Then Allah Almighty said: 'My servant hastened (to bring his death upon himself); I have made Paradise forbidden for him.'"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15879