Narrated Abdullah ibn Amr ibn al-'As:
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.
Narrated Sa'id ibn Zayd:
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.