It has been narrated on the authority of Abu Huraira (through another chain of transmitters) that the Messenger of Allah ﷺ said: Whom do you consider to be a martyr among you? They (the Companions) said: Messenger, of Allah, one who is slain in the way of Allah is a martyr. He said: Then (if this is the definition of a martyr) the martyrs of my Umma will be small in number. They asked: Messenger of Allah, who are they? He said: One who is slain in the way of Allah is a martyr;
one who dies in the way of Allah, is a martyr;
one who dies of plague is a martyr;
one who dies of cholera is a martyr. Ibn Miqsam said: I testify the truth of your father's statement (with regard to this tradition) that Prophet ﷺ said: One who is drowned is a martyr.

وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا جَرِيرٌ، عَنْ سُهَيْلٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ
قَالَ رَسُولُ اللَّهِ ﷺ " مَا تَعُدُّونَ الشَّهِيدَ فِيكُمْ " . قَالُوا يَا رَسُولَ اللَّهِ
مَنْ قُتِلَ فِي سَبِيلِ اللَّهِ فَهُوَ شَهِيدٌ قَالَ " إِنَّ شُهَدَاءَ أُمَّتِي إِذًا لَقَلِيلٌ " . قَالُوا فَمَنْ هُمْ
يَا رَسُولَ اللَّهِ قَالَ " مَنْ قُتِلَ فِي سَبِيلِ اللَّهِ فَهُوَ شَهِيدٌ وَمَنْ مَاتَ فِي سَبِيلِ اللَّهِ 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 " .