The Book of Funerals
21/112. Chapter:
The Martyr
Sunan an-Nasai
أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا يَحْيَى، عَنِ التَّيْمِيِّ، عَنْ أَبِي عُثْمَانَ، عَنْ عَامِرِ بْنِ مَالِكٍ، عَنْ صَفْوَانَ بْنِ أُمَيَّةَ، قَالَ الطَّاعُونُ وَالْمَبْطُونُ وَالْغَرِيقُ وَالنُّفَسَاءُ شَهَادَةٌ . قَالَ وَحَدَّثَنَا أَبُو عُثْمَانَ مِرَارًا وَرَفَعَهُ مَرَّةً إِلَى النَّبِيِّ صلى الله عليه وسلم .
It was narrated that Safwan bin Umayyah said: "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.
Reference : Sunan an-Nasa'i 2054In-book reference : Book 21, Hadith 237English translation : Vol. 3, Book 21, Hadith 2056