It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "Whoever is killed defending his wealth is a martyr, whoever is killed defending his family is a martyr, and whoever is killed defending his life is a martyr."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12587