Sunan an-Nasa'i, Book 37, Hadith 122 (In-Book) ⓘ
It was narrated that 'Abudllah bin 'Amr said: "The Messenger of Allah [SAW] said: 'Whoever is killed defending his wealth, he is a martyr.'"
أَخْبَرَنَا جَعْفَرُ بْنُ مُحَمَّدِ بْنِ الْهُذَيْلِ، قَالَ حَدَّثَنَا عَاصِمُ بْنُ يُوسُفَ، قَالَ حَدَّثَنَا سُعَيْرُ بْنُ الْخِمْسِ، عَنْ عَبْدِ اللَّهِ بْنِ الْحَسَنِ، عَنْ عِكْرِمَةَ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ قُتِلَ دُونَ مَالِهِ فَهُوَ شَهِيدٌ " .
also referenced under: Hadith 4087 (Reference) & Volume 5, Book 37, Hadith 4092 (DarusSalam)