(47) باب غِلَظِ تَحْرِيمِ قَتْلِ الإِنْسَانِ نَفْسَهُ وَإِنَّ مَنْ قَتَلَ نَفْسَهُ بِشَيْءٍ عُذِّبَ بِهِ فِي النَّارِ وَأَنَّهُ لاَ يَدْخُلُ الْجَنَّةَ إِلاَّ نَفْسٌ مُسْلِمَةٌ
It is narrated on the authority of Abu Huraira that the Messenger of Allah (ﷺ) observed:
He who killed himself with steel (weapon) would be the eternal denizen of the Fire of Hell and he would have that weapon in his hand and would be thrusting that in his stomach for ever and ever, he who drank poison and killed himself would sip that in the Fire of Hell where he is doomed for ever and ever; and he who killed himself by falling from (the top of) a mountain would constantly fall in the Fire of Hell and would live there for ever and ever.
Reference: Sahih Muslim 109 a
In-book reference: Book 1, Hadith 206
USC-MSA web (English) reference(deprecated numbering scheme): Book 1, Hadith 199