Sayyiduna Ibn Umar (may Allah be pleased with them both) said: "When I was fourteen years old, I was not given permission to fight; when I became fifteen, I was given permission." Hazrat Nafi' (may Allah have mercy on him) says: "I narrated this hadith to Sayyiduna Umar bin Abdul Aziz (may Allah have mercy on him), so he ordered that those under fifteen years should not be given permission to fight."