صحیح ابن حبان
Ibn Hibban
كتاب السير
Book of Expeditions
باب الخروج وكيفية الجهاد - ذكر الأمر بقتل من أنبت في دار الحرب والإغضاء على من لم ينبت-
Chapter on Setting Out and the Manner of Jihad – On the command to kill those who have reached puberty in enemy territory and to overlook those who have not.
1 hadith
Hadith 4781
Atiyyah Qarazi reports: I was among those about whom Sayyiduna Sa’d bin Mu’adh (may Allah be pleased with him) had given a verdict. The people doubted about me whether I was a minor or would be counted among the fighting men. So the Prophet Muhammad (peace and blessings be upon him) said: Examine this—if he has grown pubic hair, then kill him; if not, then do not kill him.