The Bible gives no specific command regarding suicide, nor does the word itself appear in the Bible. There are, however, references to seven people who killed themselves: Samson (Judges 16); Abimelech ( Judges 9); Saul (I Samuel 31); Saul’s armorbearer (I Samuel 31); Zimri (I Kings 16:18); Ahithophel (II Samuel 17:23); and Judas (Matthew 27:5). The earlier conduct of all seven was morally corrupt, and except for Samson their suicides were simply attempts to escape their well-deserved fates.
Suicide means self-murder and murder is forbidden by the Sixth Commandment: “Thou shalt do no murder.”
God has not given an individual — even one who could rightly judge himself deserving of the death penalty (as could most of the above) — the right to pass such a sentence. Suicide is not an acceptable way of escaping punishment, dishonor or the like.
In a different case, however, Samson died a hero, because his suicide was in fact a dedication of his life, at long last, wholly to the service of God in the liberation of Israel from the Philistines. His motive was not just to kill himself to escape. Christ Himself similarly gave His life for others.
Since a suicide experiencing quick death or unconsciousness has no opportunity to repent of his murder in this life, some have wondered if suicide is what the Bible terms the unpardonable sin. The answer is no, because the unpardonable sin is only unpardonable because it is something a person refuses to repent of.
God is merciful, not willing that any should perish (II Peter 3:9), but He simply has not called most people to repentance in this life. They will have their chance in a resurrected life after the millennium in the period known as the White Throne Judgment.
Source: The Good News, January 1979