(37) The Book of Fighting [The Prohibition of Bloodshed]
كتاب تحريم الدم
(24) Chapter: The One Who Fights to Protect His Religion
(24) باب مَنْ قَاتَلَ دُونَ دِينِهِ ‏‏
Sunan an-Nasa'i 4095 
It was narrated that Sa'eed bin Zaid said:
"The Messenger of Allah [SAW] said: 'Whoever is killed protecting his wealth, he is a martyr. Whoever is killed protecting his family, he is a martyr. Whoever is killed protecting his religion, he is a martyr. Whoever is killed protecting himself, he is a martyr.'"
أَخْبَرَنَا مُحَمَّدُ بْنُ رَافِعٍ، وَمُحَمَّدُ بْنُ إِسْمَاعِيلَ بْنِ إِبْرَاهِيمَ، قَالاَ حَدَّثَنَا سُلَيْمَانُ، - يَعْنِي ابْنَ دَاوُدَ - الْهَاشِمِيُّ قَالَ حَدَّثَنَا إِبْرَاهِيمُ، عَنْ أَبِيهِ، عَنْ أَبِي عُبَيْدَةَ بْنِ مُحَمَّدِ بْنِ عَمَّارِ بْنِ يَاسِرٍ، عَنْ طَلْحَةَ بْنِ عَبْدِ اللَّهِ بْنِ عَوْفٍ، عَنْ سَعِيدِ بْنِ زَيْدٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ مَنْ قُتِلَ دُونَ مَالِهِ فَهُوَ شَهِيدٌ وَمَنْ قُتِلَ دُونَ أَهْلِهِ فَهُوَ شَهِيدٌ وَمَنْ قُتِلَ دُونَ دِينِهِ فَهُوَ شَهِيدٌ وَمَنْ قُتِلَ دُونَ دَمِهِ فَهُوَ شَهِيدٌ ‏"‏ ‏.‏
Grade :  Sahih (Darussalam)
Reference : Sunan an-Nasa'i 4095
In-book reference : Book 37, Hadith 130
English translation : Vol. 5, Book 37, Hadith 4100