(Bamidbar 31:19) "And you, abide outside the camp seven days": What is the intent of this? From (Bamidbar 19:14) "A man if he die in a tent, all that enter the tent (while the body is still in it) … shall be unclean seven days," I would think, even straw and twigs, etc. (see Chukath #126). "you and your captives": Just as you are children of the covenant (and require sprinkling with the waters of the red heifer), so, your captives (i.e., Those girls less than three year and one day of age, who were proselytized and became unclean, require sprinkling.)