Numbers 31:17

17. The little ones The object of the command to kill every male was to exterminate the whole nation, the cup of whose iniquity was full. For the righteousness of the mode see Joshua 6:21, note. Every woman who might possibly have been engaged in the licentious worship of Peor was to share the fate of the male children, to preserve Israel from all taint of that abomination. The pure maidens could be incorporated into Israel without peril to the national religion. Joshua 6:23-25, notes. They could not be treated as concubines, since the law against fornication was in full force, (Deuteronomy 22:25-29,) but they could be lawfully married to their captors. Deuteronomy 21:10-14.