Sunan an-Nasa'i, Hadith 4091 ⓘ
It was narrated from Sa'eed bin Zaid that: The Prophet [SAW] said: "Whoever is killed defending his wealth, he is a martyr."
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا عَبْدَةُ، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ إِسْحَاقَ، عَنِ الزُّهْرِيِّ، عَنْ طَلْحَةَ بْنِ عَبْدِ اللَّهِ بْنِ عَوْفٍ، عَنْ سَعِيدِ بْنِ زَيْدٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنْ قَاتَلَ دُونَ مَالِهِ فَهُوَ شَهِيدٌ " .
also referenced under: Book 37, Hadith 126 (In-Book) & Volume 5, Book 37, Hadith 4096 (DarusSalam)