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The Prophet, salaallaahu `alayhi wa sallam said,
"A Muslim who is killed in a battle is a martyr, (dying in) plague is martyrdom, a woman who dies while delivering a baby is a martyr." (Ahmad, Daarimee, Tiyaalisee, authenticated by Al-Albaanee.)
The Prophet (salaallaahu `alayhi wa sallam) said,
"The martyrs are seven, other than the one who is killed in the Way of Allaah, ta`aalaa:
One who dies of plague,
one who drowns,
one who dies of pleurisy,
one who dies of stomach ache,
one who dies due to burning
one who dies under a demolition (by accident)
The Prophet (salaallaahu `alayhi wa sallam) said:
"Getting killed in the Path of Allaah ta`aalaa is martyrdom,
[death in] confinement during childbirth is martyrdom,
[death by] getting burned [by accident] is martyrdom,
[death by] drowning [by accident] is martyrdom,
[death due to] tuberculosis is martyrdom,
[death due to] stomach ache is martyrdom."
(Tabaraanee, Ahmad, authenticated by al-Albaanee.)