Narrated Abu Huraira Radi Allahu Anhu The Prophet Peace be upon him said,

Narrated Abu Huraira Radi Allahu Anhu The Prophet Peace be upon him said, He who commits suicide by throttling shall keep on throttling himself in the Hell Fire (forever) and he who commits suicide by stabbing himself shall keep on stabbing himself in the Hell-Fire." 
{Sahih Bukhari, Book 23, Hadith 446}

Narrated Jundub Radi Allahu Anhu: Allah's Apostle Sallallahu Alaihi wasallam said, "Amongst the nations before you there was a man who got a wound, and growing impatient (with its pain), he took a knife and cut his hand with it and the blood did not stop till he died. Allah said, 'My Slave hurried to bring death upon himself so I have forbidden him (to enter) Paradise.' 
{Sahih Bukhari, Vol 4, Book 56, No. 669}

Narrated Thabit bin Ad-Dahhak Radi Allahu Anhu : The Prophet Sallallahu Alaihi wasallam said, whoever commits suicide with something, will be punished with the same thing in the (Hell) fire 
{Sahih Bukhari, Vol 8, Book 73, No. 126}