Abd al-Mu'mn bin Khalid عبد المؤمن بن خالد الحنفي أبو خالد · The Book on Jihad

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.

"Umar said: 'This is the limit that distinguished between children and soldiers.'" And he did not mention him writing about the salary The Hadith of Ishaq bin Yusuf is a Hasan Sahih Gharib Hadith as narration of Sufyan Ath-Thawri

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…