Sahih Muslim 1915a

Zuhayr ibn Harb narrated to me: Jarir narrated to us, from Suhayl, from his father, from Abu Hurayrah, who said that the Messenger of Allah asked: “Whom do you consider a martyr among you?” They said: “Messenger of Allah, whoever is killed in the way of Allah is a martyr.” He said: “In that case, the martyrs of my community would be few.” They asked: “Then who are they, Messenger of Allah?” He said: “Whoever is killed in the way of Allah is a martyr; whoever dies in the way of Allah is a martyr; whoever dies of plague is a martyr; and whoever dies of an abdominal illness is a martyr.” Ibn Miqsam said: I affirm that your father included in this hadith the words: “And one who drowns is a martyr.”