It is narrated from Sayyiduna Sa'id bin Zayd (may Allah be pleased with him) that indeed the Prophet (peace and blessings be upon him) said: "Whoever is killed while protecting his religion is a martyr, and whoever is killed while saving his life is also a martyr."
Hadith Referenceمسند الشهاب / 342
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«إسناده صحيح ، وأخرجه أبو داود : 4772، : وترمذي : 1421، النسائي : 4100، وابن حبان فى «صحيحه» برقم: 3194»