Sahih Muslim Book - 33, Hadith - 4941

وحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ ، حَدَّثَنَا جَرِيرٌ ، عَنْ سُهَيْلٍ ، عَنْ أَبِيهِ ، عَنْ أَبِي هُرَيْرَةَ ، قَالَ : قَالَ رَسُولُ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : مَا تَعُدُّونَ الشَّهِيدَ فِيكُمْ ؟ قَالُوا : يَا رَسُولَ اللهِ ، مَنْ قُتِلَ فِي سَبِيلِ اللهِ فَهُوَ شَهِيدٌ ، قَالَ : إِنَّ شُهَدَاءَ أُمَّتِي إِذًا لَقَلِيلٌ ، قَالُوا : فَمَنْ هُمْ يَا رَسُولَ اللهِ، ؟ قَالَ : مَنْ قُتِلَ فِي سَبِيلِ اللهِ فَهُوَ شَهِيدٌ ، وَمَنْ مَاتَ فِي سَبِيلِ اللهِ فَهُوَ شَهِيدٌ ، وَمَنْ مَاتَ فِي الطَّاعُونِ فَهُوَ شَهِيدٌ ، وَمَنْ مَاتَ فِي الْبَطْنِ فَهُوَ شَهِيدٌ ، قَالَ ابْنُ مِقْسَمٍ : أَشْهَدُ عَلَى أَبِيكَ فِي هَذَا الْحَدِيثِ أَنَّهُ قَالَ : وَالْغَرِيقُ شَهِيدٌ.

It was narrated that Abu Hurairah said: "The Messenger of Allah (s.a.w) said: 'Who do you consider to be the martyrs among you?' They said: 'O Messenger of Allah, the one who is killed in the cause of Allah is a martyr.' He said: 'Then the martyrs among my Ummah will be few.' They said: 'Then who are they, O Messenger of Allah?' He said: 'The one who is killed in the cause of Allah is a martyr, the one who dies in the cause of Allah is a martyr, the one who dies of plague is a martyr, and the one who dies of a stomach disease is a martyr."' Ibn Al-Miqsam said: "I bear witness that your father said in this Hadith: 'And the one who drowns is a martyr."'