Abdullah bin Abdullah bin Jabr narrates from his father, from his grandfather, Sayyiduna Jabr (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) visited him in his illness. Someone said: We had hoped that his death would be by being killed in the path of Allah. The Messenger of Allah (peace and blessings be upon him) said: "If that were so, the martyrs of my Ummah would be very few. The one killed in the path of Allah is a martyr, the one who dies of an abdominal illness is a martyr, the one who dies of plague is a martyr, the one who drowns is a martyr, the one who is burned in a fire is a martyr, and the one who dies of pleurisy is a martyr."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1767