Hadith 11:217
'Abd al-Rahim ibn Sulayman narrated to us, from Mujalid, from al-Sha'bi, from Masruq, who said: The martyrs were mentioned in the presence of 'Umar ibn al-Khattab. 'Umar said to the people, "What do you consider the martyrs to be?" The people said, "O Commander of the Faithful, they are those who are killed in these military expeditions." 'Umar then said, "In that case, your martyrs are many. I shall inform you about that: bravery and cowardice are instincts in people that Allah places wherever He wills. The brave man fights behind those he does not care whether he returns to his family or not, while the coward flees from his wife. Rather, the martyr is he who seeks reward for his soul, the emigrant (muhajir) is he who abandons what Allah has forbidden, and the Muslim is he from whose tongue and hand the Muslims are safe."
حدثنا عبد الرحيم بن سليمان عن مجالد عن الشعبي عن مسروق قال إن الشهداء ذكروا عند عمر بن الخطاب قال فقال عمر للقوم ما ترون الشهداء قال القوم يا أمير المؤمنين هم ممن يقتل في هذه المغازي قال فقال عمر عند ذلك إن شهداءكم إذن لكثير إني أخبركم عن ذلك ان الشجاعة والجبن غرائز في الناس يضعها الله حيث يشاء فالشجاع يقاتل من وراء من لا يبالي أن لا يؤوب إلى أهله والجبان فار عن خليلته ولكن الشهيد من احتسب بنفسه والمهاجر من هجر ما نهى الله عنه والمسلم من سلم المسلمون من لسانه ويده