Sahih Muslim Book - 1, Hadith - 142

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا لَيْثٌ عَنْ ابْنِ عَجْلَانَ عَنْ مُحَمَّدِ بْنِ يَحْيَى بْنِ حَبَّانَ عَنْ ابْنِ مُحَيْرِيزٍ عَنْ الصُّنَابِحِيِّ عَنْ عُبَادَةَ بْنِ الصَّامِتِ أَنَّهُ قَالَ دَخَلْتُ عَلَيْهِ وَهُوَ فِي الْمَوْتِ فَبَكَيْتُ فَقَالَ مَهْلًا لِمَ تَبْكِي؟ فَوَاللَّهِ لَئِنْ اسْتُشْهِدْتُ لَأَشْهَدَنَّ لَكَ وَلَئِنْ شُفِّعْتُ لَأَشْفَعَنَّ لَكَ وَلَئِنْ اسْتَطَعْتُ لَأَنْفَعَنَّكَ ثُمَّ قَالَ وَاللَّهِ مَا مِنْ حَدِيثٍ سَمِعْتُهُ مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَكُمْ فِيهِ خَيْرٌ إِلَّا حَدَّثْتُكُمُوهُ إِلَّا حَدِيثًا وَاحِدًا وَسَوْفَ أُحَدِّثُكُمُوهُ الْيَوْمَ وَقَدْ أُحِيطَ بِنَفْسِي سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ مَنْ شَهِدَ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ حَرَّمَ اللَّهُ عَلَيْهِ النَّارَ.

It was narrated that As-Sunabihi said: "I entered upon 'Ubadah bin As-Samit while he was dying, and I wept. He said: 'Take it easy, why are you weeping? By Allah, if I am asked to bear witness, I will bear witness for you, and if I am asked to intercede I will intercede for you, and if I can, I will help you.' Then he said: 'By Allah, there is no Hadith that I heard from the Messenger of Allah (s.a.w) in which there is anything good for you but I narrated it to you, except for one Hadith, which I will tell you today, since I am about to die. I heard the Messenger of Allah (s.a.w) say: Whoever bears witness that none has the right to be worshipped but Allah and that Muhammad is the Messenger of Allah, Allah will forbid him to the Fire.'"