al-Fadl bin Musa al-Synany الفضل بن موسى السيناني · The Book on Jihad

From his father, from his grandfather that the Messenger of Allah (ﷺ) said: "The (lone) rider is a Shaitan, and two raiders are two Shaitan. Three is a travelling party. The Hadith of Ibn 'Umar (no, 1673) is Hasan Sahih. We do not know of it except from this route ; as a narration of 'Asim. And he is Ibn Muhammad bin Zaid bin 'Abdullah bin 'Umar. Muhammad said: "He is trustworthy, truthful. And 'Asim bin 'Umar Al-'Umari is weak…

That Ibn 'Umar said: "I was reviewed before army, and I was fourteen years old, but he did not accept me. Then I was reviewed before him later in army while I was fifteen years old, and he accepted me." Nafi said: "I narrated this Hadith to 'Umar bin 'Abdul-'Aziz and he said: 'This is the limit that distinguishes between youth and manhood.' The he wrote to give salaries to whoever reached fifteen years of age.

That he heard is father, narating a Hadith, which he heard from the Messenger of Allah (ﷺ) in which he stood among them, mentioning to them that Jihad in the cause of Allah and faith in Allah were the most virtuous of deeds. Then a man stood and said: "O Messenger of Allah! If I were killed in the cause of Allah, would my sins forgiven ?" So the Messenger of Allah (ﷺ) said: "Yes, If you are killed in…