"The plague, abdominal illness, drowning and dying in childbirth are martyrdom." (One of the narrators) said: Abu 'Uthman narrated this to us several times, and on one occasion he attributed it to the Prophet.
Sunan an-Nasa'i Book 21, Hadith 237
← Previous Hadith "O Messenger of Allah, why will the believers be tested in their graves except the martyr?" He said: "The flashing of the swords above his head is trial enough."

Sunan an-Nasa'i Book 21, Hadith 236 Next Hadith → Thos is the one at whose death the Throne shook, the gates of heaven were opened of him and seventy thousand angles attended his funeral. It squeezed him once then released him."

Sunan an-Nasa'i Book 21, Hadith 238