The Prophet ﷺ said, "Martyrs are five: the one who dies of plague, the one who dies of an abdominal disease, the one who drowns, the one who is killed under a collapsing structure, and the one who is martyred in the cause of Allah ."
حدثنا روح حدثنا مالك بن أنس عن سمي مولى أبي بكر بن عبد الرحمن عن أبي صالح السمان
أن النبي ﷺ قال الشهداء خمسة المطعون والمبطون والغرق وصاحب الهدم والشهيد في سبيل الله عز وجل
Bukhari narrated it in the Book of Prayer, and in the Book of the Sick from Abu Asim, and in the Book of Jihad from Abdullah bin Yusuf. Abu Dawud narrated it in the Book of Funerals from Qutayba, and from Ishaq bin Musa. Tirmidhi narrated it in the Book of Medicine from Qutayba.