Abu Hurairah reported,

The Messenger of Allah ﷺ asked, "Whom do you count among you as martyrs?"They replied, "Messenger of Allah, whoever is killed in the path of Allah is a martyr."He said, "Then the martyrs of my community would be few indeed."They asked, "Then who are they, Messenger of Allah?"He answered, "Whoever is killed in the path of Allah is a martyr, whoever dies in the path of Allah is a martyr, whoever dies of the plague is a martyr, and whoever dies of a stomach ailment is a martyr."Ibn Miqsam said, "I bear witness concerning your father that in this hadith he said, 'And the one who drowns is a martyr.'"

Muslim 4942

Sahih

و حدثني عبد الحميد بن بيان الواسطي حدثنا خالد عن سهيل بهذا الإسناد مثله غير أن في حديثه قال سهيل قال عبيد الله بن مقسم أشهد على أخيك أنه زاد في هذا الحديث ومن غرق فهو شهيد

مسلم 4942صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Leadership
Chapter
Explanation of the martyrs
Numbering
Darussalam 4942
Muslim 4942