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Sa'id b. Zaid reported God’s Messenger as saying, “He who is killed in defence of his religion is a martyr, he who is killed in self-defence is a martyr, he who is killed in defence of his property is a martyr, and he who is killed in defence of his family is a martyr.” Tirmidhi, Abu Dawud and Nasa’i transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَن سعيدِ بنِ زيدٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ قُتِلَ دُونَ دِينِهِ فَهُوَ شَهِيدٌ وَمَنْ قُتِلَ دُونَ دَمِهِ فَهُوَ شَهِيدٌ وَمَنْ قُتِلَ دُونَ مَالِهِ فَهُوَ شَهِيدٌ وَمَنْ قُتِلَ دُونَ أَهْلِهِ فَهُوَ شَهِيدٌ» . رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ وَالنَّسَائِيُّ
sunnah.com