(V.4:29) What is said about committing suicide.
Narrated Thâbit bin Ad-Dahhak رضي الله عنه: The Prophet صلى الله عليه وسلم said, "Whoever intentionally swears falsely by a religion other than Islâm, then he is what he had said, (e.g. if he says, ‘If such thing is not true then I am a Jew, ‘he is really a Jew if he is a liar). And whoever commits suicide with a piece of iron, will be punished with the same piece of iron in the Hell-fire."
Narrated Jundub: The Prophetصلى الله عليه وسلم said, "A man was inflicted with wounds and he committed suicide, and so Allâh said: My slave has caused death on himself hurriedly, so I forbid Paradise for him." (Sahih Al-Bukhâri, Vol. 2, Hadîth No.445).
Narrated Abu Hurairah رضي الله عنه: The Prophetصلى الله عليه وسلم said, "He who commits suicide by throttling shall keep on throttling himself in the Hell-fire, and he who commits suicide by stabbing himself shall keep on stabbing himself in the Hell-fire." (Sahih Al-Bukhâri, Vol.2, Hadîth No.446).
(V.4:31) Narrated Abu Hurairahرضي الله عنه: The Prophet صلى الله عليه وسلمsaid: "Avoid the seven great destructive sins." They (the people) asked, "O Allâh’s Messenger! What are they?" He said, "(1) To join partners in worship with Allâh, (2) to practise sorcery; (3) to kill a person which Allâh has forbidden except for a just cause (according to Islâmic law); (4) to eat up Ribâ * (usury); (5) to eat up the property of an orphan; (6) to show one’s back to the enemy and fleeing from the battlefield at the time of fighting and (7) to accuse chaste women who never even think of anything touching their chastity and are good believers." (Sahih Al-Bukhâri Vol.8, Hadîth No.840).
* (see the Glossary Appendix l)
(V.4:33) See for details Hadith No.489, Vol.3, Sahih Al-Bukhâri