The Messenger of Allah ﷺ said, "Martyrs are five, the one who dies of plague, the one who dies of an abdominal illness, the one who drowns, the one who dies under a collapsed building, and the one who is martyred in the cause of Allah."
حدثنا الأنصاري حدثنا معن حدثنا مالك ح و حدثنا قتيبة عن مالك عن سمي عن أبي صالح
أن رسول الله ﷺ قال الشهداء خمس المطعون والمبطون والغرق وصاحب الهدم والشهيد في سبيل الله
Agreed upon. Bukhari narrated it in the Book of Adhan, chapter on the merit of hastening to Dhuhr, no. 653, from Qutayba, and Muslim, no. 1914, from the hadith of Malik through the same chain, and it is in the Muwatta (1/131, Yahya's version).There are also narrations on this topic from Anas [narrated by Bukhari, no. 2830, and Muslim, no. 1916], Safwan bin Umaya [Nasai, no. 2056], Jabir bin Utayk [Abu Dawud, no. 3111, and Malik in the Muwatta 1/233, and Nasai, no. 1847], Khalid bin Urfuta [to come, no. 1064], Sulayman bin Surad [to come, no. 1064], Abu Musa [Ahmad 4/395], and Ayesha [Bukhari, no. 6619].