It was narrated from Ibn `Umar that the Messenger of Allah (ﷺ) said:
"If a man's property is targeted, and he is fought and fights back and is killed, he is a martyr." (JA)
English reference (JA): Vol. 3, Book 20, Hadith 2581 (JA)
Arabic reference (JA): Book 20, Hadith 2679 (JA)