"Whoever kills himself with (an instrument of)iron, he will come on the Day Of Judgment with his iron in his hand, to continually stab himself in his stomach with it, in the fire of Jahannam, dwelling in that state eternally. And whoever kills himself with poison, then his poison will be in his hand, to continually take it in the Fire of Jahannam, dwelling in that state eternally."  

مَنْ قَتَلَ نَفْسَهُ بِحَدِيدَةٍ جَاءَ يَوْمَ الْقِيَامَةِ وَحَدِيدَتُهُ فِي يَدِهِ يَتَوَجَّأُ بِهَا فِي بَطْنِهِ فِي نَارِ جَهَنَّمَ خَالِدًا مُخَلَّدًا أَبَدًا وَمَنْ قَتَلَ نَفْسَهُ بِسُمٍّ فَسُمُّهُ فِي يَدِهِ يَتَحَسَّاهُ فِي نَارِ جَهَنَّمَ خَالِدًا مُخَلَّدًا أَبَدًا  

"Whoever kills himself with (an instrument of)iron, his iron will be in his hand, to continually stab himself in his stomach with it, in the fire of Jahannam, dwelling in that state eternally. And whoever kills himself with poison, then his poison will be in his hand, to continually take it in the Fire of Jahannam, dwelling in that state eternally. And whoever throws himself from a mountain to kill himself, then he will be continually throwing himself in the Fire of Jahannam, dwelling in that state eternally." Another chain reports a similar narration.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ قَتَلَ نَفْسَهُ بِحَدِيدَةٍ فَحَدِيدَتُهُ فِي يَدِهِ يَتَوَجَّأُ بِهَا فِي بَطْنِهِ فِي نَارِ جَهَنَّمَ خَالِدًا مُخَلَّدًا فِيهَا أَبَدًا وَمَنْ قَتَلَ نَفْسَهُ بِسُمٍّ فَسُمُّهُ فِي يَدِهِ يَتَحَسَّاهُ فِي نَارِ جَهَنَّمَ خَالِدًا مُخَلَّدًا فِيهَا أَبَدًا وَمَنْ تَرَدَّى مِنْ جَبَلٍ فَقَتَلَ نَفْسَهُ فَهُوَ يَتَرَدَّى فِي نَارِ جَهَنَّمَ خَالِدًا مُخَلَّدًا فِيهَا أَبَدًا حَدَّثَنَا مُحَمَّدُ بْنُ الْعَلاَءِ قال حَدَّثَنَا وَكِيعٌ وَأَبُو مُعَاوِيَةَ عَنِ الأَعْمَشِ عَنْ أَبِي صَالِحٍ عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ ﷺ نَحْوَ حَدِيثِ شُعْبَةَ عَنِ الأَعْمَشِ  

"The Messenger of Allah ﷺ forbade from cures that are Khabith." [Abu 'Elsa said:] Meaning poison  

نَهَى رَسُولُ اللَّهِ ﷺ عَنِ الدَّوَاءِ الْخَبِيثِ