Yazid bin Hurmaz says: Once Najdah bin Amir wrote a letter to Sayyiduna Ibn Abbas (may Allah be pleased with them both) and asked him some questions. When Sayyiduna Ibn Abbas (may Allah be pleased with them both) was reading his letter and writing a reply, I was present there . . . . . Then the narrator mentioned the complete hadith and at the end said: You have asked whether the Prophet (peace and blessings be upon him) ever killed any child of the polytheists? So remember! The Prophet (peace and blessings be upon him) did not kill any of their children, and you should not kill anyone either. However, if you come to know about a child in the same way as Hazrat Khidr (peace be upon him) came to know about that child whom he killed, then that is a different matter (and this is not possible for you).