It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) that Najdah Haruri wrote him a letter and asked him about these issues: What is the ruling on killing children? Who are the rightful recipients of khums? When does the designation of orphanhood end for a child? Can women participate in jihad or not? Does a slave have a share in the spoils of war or not? In reply, he wrote: If you are Khidr and you know that the child will grow up to be a disbeliever, then you can kill him. As for the issue of khums, we have always said that it is our right, that is, the right of Banu Hashim and Banu Muttalib, but now a group among us says that it is not our right. The Messenger of Allah (peace and blessings be upon him) used to take women with him in jihad; they would treat the sick and nurse the wounded, but they would not participate in fighting. When a child reaches puberty, the designation of orphanhood ends for him. A slave has no share in the spoils of war, but to encourage them, they would be given something as a gift.