We need to repent of our sin:
And if you commit the sin after you have asked God to forgive you, then you have not repented of it.
Acts 3, 19 Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord;
Luke 13, 3 I tell you, Nay: but, except ye repent, ye shall all likewise perish.
"When a person commits suicide and he succeeded,where is his soul will go?"
Murder is a sin that people will go to hell for - Revelation chapter 21, 7 He that overcometh shall inherit all things; and I will be his God, and he
shall be my son.
8 But the fearful, and unbelieving, and the abominable, and murderers, and
whoremongers, and sorcerers, and idolaters, and all liars, shall have their
part in the lake which burneth with fire and brimstone: which is the
second death.
Galatians, chapter 5, 16 This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh.
17 For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would. 18 But if ye be led of the Spirit, ye are not under the law.
19 Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,
21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
22 But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith,
23 Meekness, temperance: against such there is no law.
24 And they that are Christ’s have crucified the flesh with the affections and lusts.
25 If we live in the Spirit, let us also walk in the Spirit.
1 John chapter 3, 15 Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.
Don't commit suicide. God is the answer to all the problems in life, if we will trust and obey Him.