Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) said: "Whom do you count as martyrs among you?" The people replied: "O Messenger of Allah (peace and blessings be upon him)! The one who is killed in the way of Allah is a martyr." The Prophet Muhammad (peace and blessings be upon him) said: "In that case, the martyrs of my Ummah will be few." The people asked: "O Messenger of Allah (peace and blessings be upon him)! Then who (are martyrs)?" The Prophet Muhammad (peace and blessings be upon him) said: "The one who is killed in the way of Allah is a martyr, the one who dies in the way of Allah is a martyr, the one who dies due to plague is a martyr, the one who dies due to a stomach illness is a martyr." The narrator named Suhail stated: Ubaidullah bin Maqsim told me, I testify on behalf of your father that he mentioned a fifth person in the hadith: the one who drowns and dies is a martyr.
Hadith Referenceصحیح ابن حبان / كتاب الجنائز وما يتعلق بها مقدما أو مؤخرا / 3186
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «الأحكام» (51): م.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط مسلم