The Prophet ﷺ said: If the property of anyone is designed to be taken away without any right and he fights and is killed, he is a martyr.  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ أُرِيدَ مَالُهُ بِغَيْرِ حَقٍّ فَقَاتَلَ فَقُتِلَ فَهُوَ شَهِيدٌ  

The Prophet ﷺ said: He who is killed while protecting his property is a martyr, and he who is killed while defending his family, or his blood, or his religion is a martyr.  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ قُتِلَ دُونَ مَالِهِ فَهُوَ شَهِيدٌ وَمَنْ قُتِلَ دُونَ أَهْلِهِ أَوْ دُونَ دَمِهِ أَوْ دُونَ دِينِهِ فَهُوَ شَهِيدٌ