It was narrated that 'Abdullah bin 'Amr said:
"I heard the Messenger of Allah ﷺ say: 'Whoever fights to protect his wealth and is killed, he is a martyr.'"
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا حَاتِمٌ، عَنْ عَمْرِو بْنِ دِينَارٍ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " مَنْ قَاتَلَ دُونَ مَالِهِ فَقُتِلَ فَهُوَ شَهِيدٌ " .
• Sunan an-Nasa'i, 4084
• Sunan an-Nasa'i, Vol. 5, Book of Fighting [The Prohibition of Bloodshed], Hadith 4089
• Sunan an-Nasa'i, Book of Fighting [The Prohibition of Bloodshed], Hadith 4089