Sunan an-Nasa'i, Book 37, Hadith 124 (In-Book) ⓘ
It was narrated that 'Abdullah bin 'Amr said: "The Messenger of Allah [SAW] said: 'Whoever is killed defending his wealth, he is a martyr.'"
أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا مُعَاوِيَةُ بْنُ هِشَامٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ اللَّهِ بْنِ الْحَسَنِ، عَنْ إِبْرَاهِيمَ بْنِ مُحَمَّدِ بْنِ طَلْحَةَ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ قُتِلَ دُونَ مَالِهِ فَهُوَ شَهِيدٌ " .
also referenced under: Hadith 4089 (Reference) & Volume 5, Book 37, Hadith 4094 (DarusSalam)