Sunan an-Nasa'i, Hadith 4094 ⓘ
It was narrated from Sa'eed bin Zaid that: The Prophet [SAW] said: "Whoever fights to protect his wealth and is killed, he is a martyr. Whoever fights to protect himself, he is a martyr. Whoever fights to protect his family is a martyr."
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، قَالَ حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ، عَنْ أَبِيهِ، عَنْ أَبِي عُبَيْدَةَ بْنِ مُحَمَّدٍ، عَنْ طَلْحَةَ بْنِ عَبْدِ اللَّهِ بْنِ عَوْفٍ، عَنْ سَعِيدِ بْنِ زَيْدٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنْ قَاتَلَ دُونَ مَالِهِ فَقُتِلَ فَهُوَ شَهِيدٌ وَمَنْ قَاتَلَ دُونَ دَمِهِ فَهُوَ شَهِيدٌ وَمَنْ قَاتَلَ دُونَ أَهْلِهِ فَهُوَ شَهِيدٌ " .
also referenced under: Book 37, Hadith 129 (In-Book) & Volume 5, Book 37, Hadith 4099 (DarusSalam)