Riyad as-Salihin: The Book of Jihad – Hadith No. 674 — Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah… (Hadith No. 674)

Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah (ﷺ) said, "The martyrs are of five kinds: One who dies of plague; one who dies of disease of his belly; the drowned; one who dies under the debris (of construction, etc.), and one who dies while fighting in the way of Allah."

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Explanation:

Reference: Riyad as-Salihin, The Book of Jihad, Hadith No. 674