Sunan an-Nasa'i, Hadith 4092 ⓘ
It was narrated from Sulaiman bin Buraidah that his father said: "The Messenger of Allah [SAW] said: 'Whoever is killed defending his wealth, he is a martyr.'"
أَخْبَرَنَا أَحْمَدُ بْنُ نَصْرٍ، قَالَ حَدَّثَنَا الْمُؤَمَّلُ، عَنْ سُفْيَانَ، عَنْ عَلْقَمَةَ بْنِ مَرْثَدٍ، عَنْ سُلَيْمَانَ بْنِ بُرَيْدَةَ، عَنْ أَبِيهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ قُتِلَ دُونَ مَالِهِ فَهُوَ شَهِيدٌ " .
also referenced under: Book 37, Hadith 127 (In-Book) & Volume 5, Book 37, Hadith 4097 (DarusSalam)