al-Laith bin Sa'd الليث بن سعد · The Book of Jihad

"When the Messenger of Allah (ﷺ) died and Abu Bakr (was appointed Khalifah) after him, and some of the 'Arabs disbelieved, 'Umar, may Allah be pleased with him, said: 'O Abu Bakr, how can you fight the people when the Messenger of Allah (ﷺ) said: I have been commanded to fight the people until they say La ilaha illallah (there is none worthy of worship except Allah.) Whoever says La ilaha illallah, his life and his property are safe from…

"Sahl bin Sa'd said: 'I saw Marwan sitting in the Masjid so I went and sat beside him, and he told us that Zaid bin Thabit had told him, that the Messenger of Allah (ﷺ) dictated to him the words: An-Nisa' 4:95.

"A man came to the Messenger of Allah (ﷺ) and asked him for permission to go for Jihad. He said: 'Are your parents alive?' He said: 'Yes.' He said: 'Then strive for their sake.'"

"in the year of Tabuk, the Messenger of Allah (ﷺ) addressed the people, while leaning against his mount. He said: 'Shall I not tell you of the best of the people and the worst of the people? Among the best of the people is a man who strives in the cause of Allah on the back of his horse, or on the back of his camel, or on his own two feet, until death comes to him. And among the…

"Two will never be gathered together in the Fire: A Muslim who killed a disbeliever then tried his best and did not deviate. And two will never be gathered together in the lungs of a believer: Dust in the cause of Allah, and the odor of Hell. And two will never be gathered in the heart of a salve: Faith and envy."

"I heard the Messenger of Allah (ﷺ) say: 'The eye that stays awake in the cause of Allah will be forbidden to the Fire.'"

"I heard the Messenger of Allah (ﷺ) say: 'Allah has guaranteed: 'For the one who goes out in the cause of Allah, and nothing makes him do that except faith in Me, and Jihad in My cause - that He will admit him to Paradise whether he is killed or he dies, or He will return him to his home from which he departed with whatever he has earned of reward or spoils of war.'"

"Were it not that it would be too difficult for my Ummah, I would not have stayed behind from any expedition. But they could not find mounts, and I could not find any mounts for them, and it would be too hard for them to stay behind when I went out. And I wish that I could be killed in the cause of Allah, then brought back to life, then killed, then brought back to life, then killed," three times.

"Whoever asks Allah, the mighty and Sublime, sincerely for martyrdom, Allah will cause him to reach the status of the martyrs even of he dies in his bed."

"There are five things, whoever dies of any of them is a martyr. The one who is killed in the cause of Allah is a martyr; the one who dies of an abdominal complaint in the cause of Allah is a martyr; the one who dies of the plague in the cause of Allah is a martyr; and the woman who dies in childbirth in the cause of Allah is a martyr."