It was narrated that Abu Hurairah said:
"The Messenger of Allah (ﷺ) said: 'If a man's property is wrongfully targeted, and he is killed, he is a martyr." (ID)
English reference (ID): Vol. 3, Book 20, Hadith 2582 (ID)
Arabic reference (ID): Book 20, Hadith 2680 (ID)